Version:           svn (using KDE 4.7.4) 
OS:                Linux

I just saved my file (over webdav) and clicked minimise. When I clicked to maxmise, words was in a crashed / hung state in gdb.

Reproducible: Couldn't Reproduce

Steps to Reproduce:
Save file (possibly over webdav)
Minimise
Use another app
Maxmise
... Sadly I've done this a hundred times without seeing this bug, but I'm fioling so you have the bt.

Actual Results:  
Crash

Expected Results:  
No crash :)

OS: Linux (x86_64) release 3.1-CHAKRA
Compiler: gcc

bt:
#0  0x0000000000000011 in ?? ()
#1  0x00007ffff6f6e2af in qDeleteAll<QList<QWidget*>::const_iterator> (end=<optimized out>, begin=<optimized out>) at /usr/include/QtCore/qalgorithms.h:322
#2  qDeleteAll<QList<QWidget*> > (c=...) at /usr/include/QtCore/qalgorithms.h:330
#3  ~KoToolBasePrivate (this=0x14044b0, __in_chrg=<optimized out>) at /home/user/Apps/calligra/calligra-src/libs/flake/KoToolBase_p.h:61
#4  KoToolBase::~KoToolBase (this=0x1404630, __in_chrg=<optimized out>) at /home/user/Apps/calligra/calligra-src/libs/flake/KoToolBase.cpp:52
#5  0x00007fffe0c37c59 in KarbonGradientTool::~KarbonGradientTool (this=0x1404630, __in_chrg=<optimized out>)
    at /home/user/Apps/calligra/calligra-src/karbon/plugins/tools/KarbonGradientTool.cpp:80
#6  0x00007ffff6f81723 in KoToolManager::Private::detachCanvas (this=0x13d06f0, controller=0x13f2b68)
    at /home/user/Apps/calligra/calligra-src/libs/flake/KoToolManager.cpp:460
#7  0x00007ffff6f81bfd in KoToolManager::removeCanvasController (this=0x13f2a30, controller=0x13f2b68)
    at /home/user/Apps/calligra/calligra-src/libs/flake/KoToolManager.cpp:830
#8  0x00007fffe3877e1d in KWGui::~KWGui (this=0x1296200, __in_chrg=<optimized out>) at /home/user/Apps/calligra/calligra-src/words/part/KWGui.cpp:107
#9  0x00007fffe3877e59 in KWGui::~KWGui (this=0x1296200, __in_chrg=<optimized out>) at /home/user/Apps/calligra/calligra-src/words/part/KWGui.cpp:108
#10 0x00007ffff251cdc5 in QObjectPrivate::deleteChildren() () from /usr/lib/libQtCore.so.4
#11 0x00007ffff36fc7ca in QWidget::~QWidget() () from /usr/lib/libQtGui.so.4
#12 0x00007ffff792a85e in KoView::~KoView (this=0x1245f70, __vtt_parm=0x7fffe3ade748, __in_chrg=<optimized out>)
    at /home/user/Apps/calligra/calligra-src/libs/main/KoView.cpp:193
#13 0x00007fffe3878a84 in KWView::~KWView (this=0x1245f70, __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /home/user/Apps/calligra/calligra-src/words/part/KWView.cpp:171
#14 0x00007fffe3878ad9 in KWView::~KWView (this=0x1245f70, __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /home/user/Apps/calligra/calligra-src/words/part/KWView.cpp:174
#15 0x00007ffff790cdcb in KoMainWindow::setRootDocument (this=0x94d4d0, doc=0x0) at /home/user/Apps/calligra/calligra-src/libs/main/KoMainWindow.cpp:475
#16 0x00007ffff790d1d9 in closeEvent (e=0x7fffffffcba0, this=0x94d4d0) at /home/user/Apps/calligra/calligra-src/libs/main/KoMainWindow.cpp:1050
#17 KoMainWindow::closeEvent (this=0x94d4d0, e=0x7fffffffcba0) at /home/user/Apps/calligra/calligra-src/libs/main/KoMainWindow.cpp:1033
#18 0x00007ffff370172e in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#19 0x00007ffff3a9f81b in QMainWindow::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x00007ffff44b8b38 in KXmlGuiWindow::event(QEvent*) () from /usr/lib/libkdeui.so.5
#21 0x00007ffff36b0d94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x00007ffff36b5c01 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#23 0x00007ffff43bbe26 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#24 0x00007ffff250b2fc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#25 0x00007ffff36fc2dd in QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) () from /usr/lib/libQtGui.so.4
#26 0x00007ffff790d72b in KoMainWindow::qt_metacall (this=0x94d4d0, _c=QMetaObject::InvokeMetaMethod, _id=17, _a=0x7fffffffcd40)
    at /home/user/Apps/calligra/calligra-build/libs/main/KoMainWindow.moc:152
#27 0x00007ffff251df0a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#28 0x00007ffff36aa782 in QAction::triggered(bool) () from /usr/lib/libQtGui.so.4
#29 0x00007ffff36aa96f in QAction::activate(QAction::ActionEvent) () from /usr/lib/libQtGui.so.4
#30 0x00007ffff36aaadf in QAction::event(QEvent*) () from /usr/lib/libQtGui.so.4
#31 0x00007ffff42d53ca in KAction::event(QEvent*) () from /usr/lib/libkdeui.so.5
#32 0x00007ffff36b0d94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#33 0x00007ffff36b5c01 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#34 0x00007ffff43bbe26 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#35 0x00007ffff250b2fc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#36 0x00007ffff36e2c09 in ?? () from /usr/lib/libQtGui.so.4
#37 0x00007ffff36e40fd in ?? () from /usr/lib/libQtGui.so.4
#38 0x00007ffff36b784f in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#39 0x00007ffff43bbe26 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#40 0x00007ffff250b2fc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#41 0x00007ffff374fbd9 in ?? () from /usr/lib/libQtGui.so.4
#42 0x00007ffff375001b in ?? () from /usr/lib/libQtGui.so.4
#43 0x00007ffff372c654 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#44 0x00007ffff3754032 in ?? () from /usr/lib/libQtGui.so.4
#45 0x00007fffebdcb6d3 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#46 0x00007fffebdcbeb0 in ?? () from /usr/lib/libglib-2.0.so.0
#47 0x00007fffebdcc14d in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#48 0x00007ffff2535f16 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#49 0x00007ffff3753cae in ?? () from /usr/lib/libQtGui.so.4
#50 0x00007ffff250a4f2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#51 0x00007ffff250a6f7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#52 0x00007ffff250e8eb in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#53 0x00007ffff7bdbfed in kdemain (argc=<optimized out>, argv=0x7fffffffe578) at /home/user/Apps/calligra/calligra-src/words/part/main.cpp:43
#54 0x00007ffff168b17d in __libc_start_main () from /lib/libc.so.6
#55 0x0000000000400841 in _start ()