Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          x86_64-pc-linux-gnu-4.2.3 
OS:                Linux

I was trying to move some mail folders when this happened. I did move 3 folders before and everything went ok
Application: KMail (kmail), signal SIGSEGV                  
[Thread debugging using libthread_db enabled]               
[New Thread 0x2b3be2d0a230 (LWP 4220)]                      
[New Thread 0x41001950 (LWP 4276)]                          
[New Thread 0x40800950 (LWP 4250)]                          
[KCrash handler]                                            
#5  0x00002b3bde1d636a in Q3ListView::contentsMousePressEventEx (
    this=0x981e70, e=0x7fffd8340a20) at itemviews/q3listview.cpp:4161
#6  0x00002b3bda904795 in K3ListView::contentsMousePressEvent (this=0x981e70, 
    e=0x7fffd8340a20)                                                         
    at /var/tmp/paludis/kde-base-kdelibs-scm/work/kdelibs-scm/kde3support/kdeui/k3listview.cpp:790
#7  0x00002b3bde2244a9 in Q3ScrollView::viewportMousePressEvent (                                 
    this=0x981e70, e=0x7fffd8341330) at widgets/q3scrollview.cpp:1744                             
#8  0x00002b3bde225ff2 in Q3ScrollView::eventFilter (this=0x981e70,                               
    obj=0x981c10, e=0x7fffd8341330) at widgets/q3scrollview.cpp:1472                              
#9  0x00002b3bde1ce63e in Q3ListView::eventFilter (this=0x981e70, o=0x981c10,                     
    e=0x7fffd8341330) at itemviews/q3listview.cpp:3777                                            
#10 0x00002b3bd4371fa2 in KMFolderTree::eventFilter (this=0x981e70,                               
    o=0x981c10, e=0x7fffd8341330)                                                                 
    at /var/tmp/paludis/kde-base-kmail-scm/work/kmail/kmail/kmfoldertree.cpp:1807                 
#11 0x00002b3bd2acffed in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x981c10, event=0x7fffd8341330)
    at kernel/qcoreapplication.cpp:694                                                                                                                
#12 0x00002b3bdd4b75d0 in QApplicationPrivate::notify_helper (this=0x62f430,                                                                          
    receiver=0x981c10, e=0x7fffd8341330) at kernel/qapplication.cpp:3762                                                                              
#13 0x00002b3bdd4bc815 in QApplication::notify (this=<value optimized out>,                                                                           
    receiver=0x981c10, e=0x7fffd8341330) at kernel/qapplication.cpp:3495                                                                              
#14 0x00002b3bd7c5fe7e in KApplication::notify (this=0x7fffd8341de0,                                                                                  
    receiver=0x981c10, event=0x7fffd8341330)                                                                                                          
    at /var/tmp/paludis/kde-base-kdelibs-scm/work/kdelibs-scm/kdeui/kernel/kapplication.cpp:311                                                       
#15 0x00002b3bd2acfd38 in QCoreApplication::notifyInternal (                                                                                          
    this=0x7fffd8341de0, receiver=0x981c10, event=0x7fffd8341330)                                                                                     
    at kernel/qcoreapplication.cpp:587                                                                                                                
#16 0x00002b3bdd4b9aff in QApplicationPrivate::sendMouseEvent (
    receiver=0x981c10, event=0x7fffd8341330,
    alienWidget=<value optimized out>, nativeWidget=0x815bf0,
    buttonDown=<value optimized out>, lastMouseReceiver=@0x2b3bdde806b0)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#17 0x00002b3bdd521b36 in QETWidget::translateMouseEvent (this=0x815bf0,
    event=<value optimized out>) at kernel/qapplication_x11.cpp:4112
#18 0x00002b3bdd5208a0 in QApplication::x11ProcessEvent (this=0x1a6,
    event=0x7fffd8341ab0) at kernel/qapplication_x11.cpp:3234
#19 0x00002b3bdd545394 in QEventDispatcherX11::processEvents (this=0x62ed40,
    flags=@0x7fffd8341bc0) at kernel/qeventdispatcher_x11.cpp:134
#20 0x00002b3bd2acf135 in QEventLoop::processEvents (
    this=<value optimized out>, flags=@0x7fffd8341c00)
    at kernel/qeventloop.cpp:149
#21 0x00002b3bd2acf28e in QEventLoop::exec (this=0x7fffd8341c40,
    flags=@0x7fffd8341c50) at kernel/qeventloop.cpp:200
#22 0x00002b3bd2ad12e9 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:845
#23 0x000000000040336e in main (argc=<value optimized out>,
    argv=<value optimized out>)
    at /var/tmp/paludis/kde-base-kmail-scm/work/kmail/kmail/main.cpp:132
#0  0x00002b3bdede9c21 in nanosleep () from /lib64/libc.so.6