Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

I have a folder with pictures which are shown with the "Show in groups" (kcategorizedview?) option toggled (sorted by date... it does matter!). If I start dolphin on that folder everything is ok; when I switch to a folder without the "show in groups" option, dolphin crashes. 
The same happens if I start dolphin on the home dir and then change to the folder with "show in groups" toggled

here is the backtrace: 
Application: Dolphin (dolphin), signal SIGABRT
0x00007fd85b8847e1 in nanosleep () from /lib/libc.so.6

Thread 1 (Thread 0x7fd85fe2f700 (LWP 22234)):
[KCrash Handler]                             
#5  0x00007fd85b8223c5 in raise () from /lib/libc.so.6
#6  0x00007fd85b82373e in abort () from /lib/libc.so.6
#7  0x00007fd85d09a395 in qt_message_output (msgType=QtFatalMsg, buf=<value optimized out>) at global/qglobal.cpp:2108
#8  0x00007fd85d09a4c7 in qFatal (msg=<value optimized out>) at global/qglobal.cpp:2309                               
#9  0x00007fd85f0adc62 in DolphinModel::displayRoleData (this=<value optimized out>, index=<value optimized out>)     
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinmodel.cpp:237                      
#10 0x00007fd85f0addc6 in DolphinModel::data (this=0x56da, index=@0x6, role=-1) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinmodel.cpp:66                                                                   
#11 0x00007fd85c9869ad in QSortFilterProxyModel::data (this=<value optimized out>, index=@0x7fff67e68520, role=399415562) at itemviews/qsortfilterproxymodel.cpp:1511                                                                         
#12 0x00007fd85df67362 in KCategorizedView::rowsInsertedArtifficial (this=0x8d96e0, parent=<value optimized out>, start=<value optimized out>, end=<value optimized out>)                                                                     
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs-9999/kdeui/itemviews/kcategorizedview.cpp:1549              
#13 0x00007fd85df675de in KCategorizedView::Private::layoutChanged (this=0x8d8bc0, forceItemReload=false)              
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs-9999/kdeui/itemviews/kcategorizedview.cpp:491               
#14 0x00007fd85df64851 in KCategorizedView::qt_metacall (this=0x8d96e0, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0x7fff67e688c0)                                                                                                           
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs_build/kdeui/kcategorizedview.moc:85                         
#15 0x00007fd85f0a4ef5 in DolphinIconsView::qt_metacall (this=0x56da, _c=22234, _id=6, _a=0xffffffffffffffff)          
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin_build/apps/dolphin/src/dolphiniconsview.moc:70              
#16 0x00007fd85d1a5c0c in QMetaObject::activate (sender=0x8c0180, from_signal_index=<value optimized out>, to_signal_index=6, argv=0xffffffffffffffff) at kernel/qobject.cpp:3028                                                             
#17 0x00007fd85c988f22 in QSortFilterProxyModelPrivate::sort (this=0x8c0280) at itemviews/qsortfilterproxymodel.cpp:347
#18 0x00007fd85f0b19dd in DolphinView::applyViewProperties (this=0x8df7e0, url=<value optimized out>) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinview.cpp:1203                                            
#19 0x00007fd85f0b31f5 in DolphinView::updateView (this=0x8df7e0, url=@0x7fff67e68a60, rootUrl=@0x7fff67e68a30)        
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinview.cpp:490                        
#20 0x00007fd85f0b329b in DolphinView::setUrl (this=0x8df7e0, url=@0x7fff67e68a60) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinview.cpp:585                                                                
#21 0x000000000042f313 in DolphinViewContainer::slotItemTriggered (this=0x8616d0, item=@0x7fff67e68d60)                
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinviewcontainer.cpp:427               
#22 0x00000000004301c6 in DolphinViewContainer::qt_metacall (this=0x8616d0, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fff67e68bc0)                                                                                                       
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin_build/apps/dolphin/src/dolphinviewcontainer.moc:110         
#23 0x00007fd85d1a5c0c in QMetaObject::activate (sender=0x8df7e0, from_signal_index=<value optimized out>, to_signal_index=30, argv=0xffffffffffffffff) at kernel/qobject.cpp:3028                                                            
#24 0x00007fd85f0b0d05 in DolphinView::itemTriggered (this=0x56da, _t1=<value optimized out>) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin_build/apps/dolphin/src/dolphinview.moc:236                                               
#25 0x00007fd85f0b29a2 in DolphinView::triggerItem (this=0x8df7e0, item=@0x7fff67e68d60) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinview.cpp:895                                                          
#26 0x00007fd85f0b4b12 in DolphinView::qt_metacall (this=0x8df7e0, _c=QMetaObject::InvokeMetaMethod, _id=37, _a=0x7fff67e68d40)                                                                                                               
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin_build/apps/dolphin/src/dolphinview.moc:192                  
#27 0x00007fd85d1a5c0c in QMetaObject::activate (sender=0x8c0890, from_signal_index=<value optimized out>, to_signal_index=13, argv=0xffffffffffffffff) at kernel/qobject.cpp:3028                                                            
#28 0x00007fd85f09f025 in DolphinController::itemTriggered (this=0x56da, _t1=<value optimized out>)                    
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin_build/apps/dolphin/src/dolphincontroller.moc:193            
#29 0x00007fd85f09f6cb in DolphinController::triggerItem (this=0x8c0890, index=@0xd27110) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphincontroller.cpp:177                                                   
#30 0x00007fd85f09f78e in DolphinController::qt_metacall (this=0x8c0890, _c=QMetaObject::InvokeMetaMethod, _id=15, _a=0x7fff67e68ef0)                                                                                                         
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin_build/apps/dolphin/src/dolphincontroller.moc:116            
#31 0x00007fd85d1a5c0c in QMetaObject::activate (sender=0x8d96e0, from_signal_index=<value optimized out>, to_signal_index=32, argv=0xffffffffffffffff) at kernel/qobject.cpp:3028                                                            
#32 0x00007fd85c8fcb45 in QAbstractItemView::clicked (this=0x56da, _t1=<value optimized out>) at .moc/debug-shared/moc_qabstractitemview.cpp:316                                                                                              
#33 0x00007fd85c909223 in QAbstractItemView::mouseReleaseEvent (this=0x8d96e0, event=0x7fff67e69f80) at itemviews/qabstractitemview.cpp:1618                                                                                                  
#34 0x00007fd85c91ef67 in QListView::mouseReleaseEvent (this=0x56da, e=0x56da) at itemviews/qlistview.cpp:825          
#35 0x00007fd85df69b1c in KCategorizedView::mouseReleaseEvent (this=0x56da, event=0x56da) at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs-9999/kdeui/itemviews/kcategorizedview.cpp:1135                                               
#36 0x00007fd85c4a8d27 in QWidget::event (this=0x8d96e0, event=0x7fff67e69f80) at kernel/qwidget.cpp:7169              
#37 0x00007fd85c7deef6 in QFrame::event (this=0x8d96e0, e=0x7fff67e69f80) at widgets/qframe.cpp:657                    
#38 0x00007fd85c86a62a in QAbstractScrollArea::viewportEvent (this=0x56da, e=0x56da) at widgets/qabstractscrollarea.cpp:949                                                                                                                   
#39 0x00007fd85c9098ec in QAbstractItemView::viewportEvent (this=0x8d96e0, event=0x7fff67e69f80) at itemviews/qabstractitemview.cpp:1435
#40 0x00007fd85c86c048 in QAbstractScrollAreaFilter::eventFilter (this=<value optimized out>, o=<value optimized out>,e=0x6) at widgets/qabstractscrollarea_p.h:102
#41 0x00007fd85d19083c in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x8dfed0, event=0x7fff67e69f80) at kernel/qcoreapplication.cpp:700
#42 0x00007fd85c457d4f in QApplicationPrivate::notify_helper (this=0x69bd60, receiver=0x8dfed0, e=0x7fff67e69f80) at kernel/qapplication.cpp:3805
#43 0x00007fd85c459dcf in QApplication::notify (this=<value optimized out>, receiver=0x8dfed0, e=0x7fff67e69f80) at kernel/qapplication.cpp:3534
#44 0x00007fd85df7db61 in KApplication::notify (this=0x7fff67e6a920, receiver=0x8dfed0, event=0x7fff67e69f80)
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs-9999/kdeui/kernel/kapplication.cpp:307
#45 0x00007fd85d190468 in QCoreApplication::notifyInternal (this=0x7fff67e6a920, receiver=0x8dfed0, event=0x7fff67e69f80) at kernel/qcoreapplication.cpp:593
#46 0x00007fd85c45de4e in QApplicationPrivate::sendMouseEvent (receiver=0x8dfed0, event=0x7fff67e69f80, alienWidget=0x8dfed0, nativeWidget=0x74c620, buttonDown=<value optimized out>,
    lastMouseReceiver=@0x7fd85ce266f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#47 0x00007fd85c4c100b in QETWidget::translateMouseEvent (this=0x74c620, event=<value optimized out>) at kernel/qapplication_x11.cpp:4048
#48 0x00007fd85c4bfd03 in QApplication::x11ProcessEvent (this=0x1a5, event=0x7fff67e6a640) at kernel/qapplication_x11.cpp:3166
#49 0x00007fd85c4e4c32 in QEventDispatcherX11::processEvents (this=0x686850, flags=@0x7fff67e6a810) at kernel/qeventdispatcher_x11.cpp:134
#50 0x00007fd85d18f825 in QEventLoop::processEvents (this=<value optimized out>, flags=@0x7fff67e6a850) at kernel/qeventloop.cpp:149
#51 0x00007fd85d18f98a in QEventLoop::exec (this=0x7fff67e6a890, flags=@0x7fff67e6a8a0) at kernel/qeventloop.cpp:200
#52 0x00007fd85d191ace in QCoreApplication::exec () at kernel/qcoreapplication.cpp:851
#53 0x000000000043f16d in main (argc=2, argv=0x7fff67e6ae18) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/main.cpp:94

The same happens with konqueror, with similar backtrace:
Application: Konqueror (konqueror), signal SIGABRT
0x00007f33f90f67b0 in nanosleep () from /lib/libc.so.6

Thread 1 (Thread 0x7f33fe4ed700 (LWP 23421)):
[KCrash Handler]                             
#5  0x00007f33f90943c5 in raise () from /lib/libc.so.6
#6  0x00007f33f909573e in abort () from /lib/libc.so.6
#7  0x00007f33fba7a395 in qt_message_output (msgType=QtFatalMsg, buf=<value optimized out>) at global/qglobal.cpp:2108
#8  0x00007f33fba7a4c7 in qFatal (msg=<value optimized out>) at global/qglobal.cpp:2309                               
#9  0x00007f33eef1ac62 in DolphinModel::displayRoleData (this=<value optimized out>, index=<value optimized out>)     
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinmodel.cpp:237                      
#10 0x00007f33eef1adc6 in DolphinModel::data (this=0x5b7d, index=@0x6, role=-1) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinmodel.cpp:66                                                                   
#11 0x00007f33fb3669ad in QSortFilterProxyModel::data (this=<value optimized out>, index=@0x7fff06522650, role=399415562) at itemviews/qsortfilterproxymodel.cpp:1511                                                                         
#12 0x00007f33fc947362 in KCategorizedView::rowsInsertedArtifficial (this=0xe3c7f0, parent=<value optimized out>, start=<value optimized out>, end=<value optimized out>)                                                                     
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs-9999/kdeui/itemviews/kcategorizedview.cpp:1549              
#13 0x00007f33fc9475de in KCategorizedView::Private::layoutChanged (this=0xe3ee10, forceItemReload=false)              
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs-9999/kdeui/itemviews/kcategorizedview.cpp:491               
#14 0x00007f33fc944851 in KCategorizedView::qt_metacall (this=0xe3c7f0, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0x7fff065229f0)                                                                                                           
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs_build/kdeui/kcategorizedview.moc:85                         
#15 0x00007f33eef11ef5 in DolphinIconsView::qt_metacall (this=0x5b7d, _c=23421, _id=6, _a=0xffffffffffffffff)          
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin_build/apps/dolphin/src/dolphiniconsview.moc:70              
#16 0x00007f33fbb85c0c in QMetaObject::activate (sender=0xdf0ae0, from_signal_index=<value optimized out>, to_signal_index=6, argv=0xffffffffffffffff) at kernel/qobject.cpp:3028                                                             
#17 0x00007f33fb368f22 in QSortFilterProxyModelPrivate::sort (this=0xe1f7b0) at itemviews/qsortfilterproxymodel.cpp:347
#18 0x00007f33eef1e9dd in DolphinView::applyViewProperties (this=0xe0dde0, url=<value optimized out>) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinview.cpp:1203                                            
#19 0x00007f33eef201f5 in DolphinView::updateView (this=0xe0dde0, url=@0x7fff065230c0, rootUrl=@0x7fff06522b60)        
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinview.cpp:490                        
#20 0x00007f33eef2029b in DolphinView::setUrl (this=0xe0dde0, url=@0x7fff065230c0) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinview.cpp:585                                                                
#21 0x00007f33ef15daa6 in DolphinPart::openUrl (this=0xdf16c0, url=@0x7fff065230c0) at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin/apps/dolphin/src/dolphinpart.cpp:274                                                               
#22 0x00007f33fe0695eb in KonqView::openUrl (this=0x65cb10, url=@0x7fff065230c0, locationBarURL=@0x7fff06523130, nameFilter=@0x7fff06523428, tempFile=false)                                                                                  
    at /var/tmp/portage/kde-base/konqueror-9999/work/konqueror/apps/konqueror/src/konqview.cpp:231                     
#23 0x00007f33fe0a6daf in KonqMainWindow::openView (this=0x6aba00, mimeType=@0x7fff06523710, _url=<value optimized out>, childView=0x65cb10, req=@0x7fff06523420)                                                                             
    at /var/tmp/portage/kde-base/konqueror-9999/work/konqueror/apps/konqueror/src/konqmainwindow.cpp:935               
#24 0x00007f33fe0a8c48 in KonqMainWindow::openUrl (this=0x6aba00, _view=0x65cb10, _url=@0x7fff06523cc0, _mimeType=<value optimized out>, _req=@0x7fff06523870, trustedSource=true)                                                            
    at /var/tmp/portage/kde-base/konqueror-9999/work/konqueror/apps/konqueror/src/konqmainwindow.cpp:633               
#25 0x00007f33fe0aadfb in KonqMainWindow::openUrlRequestHelper (this=0x6aba00, childView=0x65cb10, url=@0x7fff06523cc0, args=@0x7fff06523cd0, browserArgs=<value optimized out>)                                                              
    at /var/tmp/portage/kde-base/konqueror-9999/work/konqueror/apps/konqueror/src/konqmainwindow.cpp:1021              
#26 0x00007f33fe0aafb7 in KonqMainWindow::slotOpenURLRequest (this=0x6aba00, url=@0x7fff06523cc0, args=@0x7fff06523cd0, browserArgs=@0x7fff06523cd8)                                                                                          
    at /var/tmp/portage/kde-base/konqueror-9999/work/konqueror/apps/konqueror/src/konqmainwindow.cpp:1011              
#27 0x00007f33fe0acf41 in KonqMainWindow::qt_metacall (this=0x6aba00, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0x7fff06523c90)                                                                                                            
    at /var/tmp/portage/kde-base/konqueror-9999/work/konqueror_build/apps/konqueror/src/konqmainwindow.moc:344         
#28 0x00007f33fbb85c0c in QMetaObject::activate (sender=0xdf0db0, from_signal_index=<value optimized out>, to_signal_index=9, argv=0xffffffffffffffff) at kernel/qobject.cpp:3028                                                             
#29 0x00007f33fd75e0ff in KParts::BrowserExtension::openUrlRequestDelayed (this=0x5b7d, _t1=<value optimized out>, _t2=<value optimized out>, _t3=<value optimized out>)                                                                      
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs_build/kparts/browserextension.moc:285                       
#30 0x00007f33fd760a50 in KParts::BrowserExtension::slotEmitOpenUrlRequestDelayed (this=0xdf0db0) at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs-9999/kparts/browserextension.cpp:668                                                 
#31 0x00007f33fd760c05 in KParts::BrowserExtension::qt_metacall (this=0xdf0db0, _c=QMetaObject::InvokeMetaMethod, _id=42, _a=0x7fff065242f0)                                                                                                  
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs_build/kparts/browserextension.moc:224                       
#32 0x00007f33ef15cf5d in DolphinPartBrowserExtension::qt_metacall (this=0x5b7d, _c=23421, _id=6, _a=0xffffffffffffffff)
    at /var/tmp/portage/kde-base/dolphin-9999/work/dolphin_build/apps/dolphin/src/dolphinpart.moc:222
#33 0x00007f33fbb85c0c in QMetaObject::activate (sender=0xb13d90, from_signal_index=<value optimized out>, to_signal_index=4, argv=0xffffffffffffffff) at kernel/qobject.cpp:3028
#34 0x00007f33fbb8e3df in QSingleShotTimer::timerEvent (this=0xb13d90) at kernel/qtimer.cpp:300
#35 0x00007f33fbb81b0a in QObject::event (this=0xb13d90, e=0x5b7d) at kernel/qobject.cpp:1117
#36 0x00007f33fae37d7e in QApplicationPrivate::notify_helper (this=0x6197d0, receiver=0xb13d90, e=0x7fff06524930) at kernel/qapplication.cpp:3809
#37 0x00007f33fae39c07 in QApplication::notify (this=0x7fff06524ea0, receiver=0xb13d90, e=0x7fff06524930) at kernel/qapplication.cpp:3774
#38 0x00007f33fc95db61 in KApplication::notify (this=0x7fff06524ea0, receiver=0xb13d90, event=0x7fff06524930)
    at /var/tmp/portage/kde-base/kdelibs-9999/work/kdelibs-9999/kdeui/kernel/kapplication.cpp:307
#39 0x00007f33fbb70468 in QCoreApplication::notifyInternal (this=0x7fff06524ea0, receiver=0xb13d90, event=0x7fff06524930) at kernel/qcoreapplication.cpp:593
#40 0x00007f33fbb9d709 in QTimerInfoList::activateTimers (this=0x61ac30) at kernel/qcoreapplication.h:215
#41 0x00007f33fbb9ed40 in QEventDispatcherUNIX::processEvents (this=0x6196d0, flags=@0x7fff06524b90) at kernel/qeventdispatcher_unix.cpp:899
#42 0x00007f33faec4cab in QEventDispatcherX11::processEvents (this=0x6196d0, flags=@0x7fff06524be0) at kernel/qeventdispatcher_x11.cpp:154
#43 0x00007f33fbb6f825 in QEventLoop::processEvents (this=<value optimized out>, flags=@0x7fff06524c20) at kernel/qeventloop.cpp:149
#44 0x00007f33fbb6f98a in QEventLoop::exec (this=0x7fff06524c60, flags=@0x7fff06524c70) at kernel/qeventloop.cpp:200
#45 0x00007f33fbb71ace in QCoreApplication::exec () at kernel/qcoreapplication.cpp:851
#46 0x00007f33fe0d2276 in kdemain (argc=<value optimized out>, argv=<value optimized out>) at /var/tmp/portage/kde-base/konqueror-9999/work/konqueror/apps/konqueror/src/konqmain.cpp:257
#47 0x00007f33f9081b74 in __libc_start_main () from /lib/libc.so.6
#48 0x00000000004008e9 in _start ()