Version:           2.2.1 (using KDE 4.2.1)
OS:                Linux
Installed from:    Debian testing/unstable Packages

Reproduction process:

1- Create 2 classes
2- Create an association betweem them
3- Open the properties window for the association
4- Click ok (no changes made)
5- Click in any place of the edit zone
6- Application crash

Debug:

Aplicación: Modelador de UML Umbrello (umbrello), señal SIGSEGV

Thread 1 (Thread 0xb5bb4700 (LWP 6000)):
[KCrash Handler]
#6  0x08671fe7 in AssociationWidget::slotRemovePopupMenu (this=0x9df81a8) at ../../../umbrello/umbrello/associationwidget.cpp:3196
#7  0x0867e910 in AssociationWidget::qt_metacall (this=0x9df81a8, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xbf86a6d8) at ./associationwidget.moc:77
#8  0xb69dabe0 in QMetaObject::activate (sender=0x9cfa1b0, from_signal_index=53, to_signal_index=53, argv=0x0) at kernel/qobject.cpp:3031
#9  0xb69db962 in QMetaObject::activate (sender=0x9cfa1b0, m=0x87f64e4, local_signal_index=2, argv=0x0) at kernel/qobject.cpp:3101
#10 0x0876de69 in UMLView::sigRemovePopupMenu (this=0x9cfa1b0) at ./umlview.moc:165
#11 0x08714cb5 in ToolBarState::mousePress (this=0x9cfd2d0, ome=0xbf86a7ac) at ../../../umbrello/umbrello/umlview.h:926
#12 0x0876e70f in UMLView::contentsMousePressEvent (this=0x9cfa1b0, ome=0xbf86a7ac) at ../../../umbrello/umbrello/umlview.cpp:1243
#13 0xb66dff61 in Q3ScrollView::viewportMousePressEvent (this=0x9cfa1b0, e=0xbf86ad3c) at widgets/q3scrollview.cpp:1738
#14 0xb66e1b40 in Q3ScrollView::eventFilter (this=0x9cfa1b0, obj=0x9cf9b68, e=0xbf86ad3c) at widgets/q3scrollview.cpp:1466
#15 0xb69c52ca in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x9881c10, receiver=0x9cf9b68, event=0xbf86ad3c) at kernel/qcoreapplication.cpp:694
#16 0xb6be677a in QApplicationPrivate::notify_helper (this=0x9881c10, receiver=0x9cf9b68, e=0xbf86ad3c) at kernel/qapplication.cpp:3799
#17 0xb6beefd1 in QApplication::notify (this=0xbf86b510, receiver=0x9cf9b68, e=0xbf86ad3c) at kernel/qapplication.cpp:3528
#18 0xb783394d in KApplication::notify (this=0xbf86b510, receiver=0x9cf9b68, event=0xbf86ad3c) at ../../kdeui/kernel/kapplication.cpp:307
#19 0xb69c60e1 in QCoreApplication::notifyInternal (this=0xbf86b510, receiver=0x9cf9b68, event=0xbf86ad3c) at kernel/qcoreapplication.cpp:587
#20 0xb6bee25e in QApplicationPrivate::sendMouseEvent (receiver=0x9cf9b68, event=0xbf86ad3c, alienWidget=0x9cf9b68, nativeWidget=0x9959948, buttonDown=0xb73a9670, lastMouseReceiver=@0xb73a9674)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:212
#21 0xb6c57e2d in QETWidget::translateMouseEvent (this=0x9959948, event=0xbf86b22c) at kernel/qapplication_x11.cpp:4044
#22 0xb6c56c11 in QApplication::x11ProcessEvent (this=0xbf86b510, event=0xbf86b22c) at kernel/qapplication_x11.cpp:3162
#23 0xb6c8063a in x11EventSourceDispatch (s=0x9884e68, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:142
#24 0xb5e08718 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#25 0xb5e0bc7b in ?? () from /usr/lib/libglib-2.0.so.0
#26 0x09883ef8 in ?? ()
#27 0x00000000 in ?? ()