This just happened to me in Feisty Kubuntu. KDE said that it seems to be a distribution specific problem. Backtrace: (no debugging symbols found) Using host libthread_db library "/lib/libthread_db.so.1". (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [Thread debugging using libthread_db enabled] [New Thread 47392122996432 (LWP 6787)] (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [KCrash handler] #5 0x00002b1a50876891 in __dynamic_cast () from /usr/lib/libstdc++.so.6 #6 0x000000000045636c in ?? () #7 0x0000000000458443 in ?? () #8 0x00002b1a5218ca52 in QWidget::event () from /usr/lib/libqt-mt.so.3 #9 0x00002b1a520f31d6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #10 0x00002b1a520f5a4a in QApplication::notify () from /usr/lib/libqt-mt.so.3 #11 0x00002b1a51a437a8 in KApplication::notify () from /usr/lib/libkdecore.so.4 #12 0x00002b1a52085cc2 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3 #13 0x00002b1a5218ed40 in QWidget::show () from /usr/lib/libqt-mt.so.3 #14 0x00000000004d1f58 in adept::ExtendableList::updateExtender () #15 0x00000000004d2b9f in ?? () #16 0x00000000004d2113 in ?? () #17 0x00002b1a5218c8ee in QWidget::event () from /usr/lib/libqt-mt.so.3 #18 0x00002b1a5147d68a in KListView::event () from /usr/lib/libkdeui.so.4 #19 0x00002b1a520f31d6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #20 0x00002b1a520f5a4a in QApplication::notify () from /usr/lib/libqt-mt.so.3 #21 0x00002b1a51a437a8 in KApplication::notify () from /usr/lib/libkdecore.so.4 #22 0x00002b1a52085cc2 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3 #23 0x00002b1a520bea6d in QWidget::internalSetGeometry () from /usr/lib/libqt-mt.so.3 #24 0x00002b1a521915ac in QWidget::setGeometry () from /usr/lib/libqt-mt.so.3 #25 0x00002b1a520ef119 in QWidgetItem::setGeometry () from /usr/lib/libqt-mt.so.3 #26 0x00002b1a5213e0a4 in QBoxLayout::setGeometry () from /usr/lib/libqt-mt.so.3 #27 0x00002b1a520ee248 in QLayout::eventFilter () from /usr/lib/libqt-mt.so.3 #28 0x00002b1a521572e1 in QObject::activate_filters () from /usr/lib/libqt-mt.so.3 #29 0x00002b1a5215735a in QObject::event () from /usr/lib/libqt-mt.so.3 #30 0x00002b1a5218c301 in QWidget::event () from /usr/lib/libqt-mt.so.3 #31 0x00002b1a520f31d6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #32 0x00002b1a520f5a4a in QApplication::notify () from /usr/lib/libqt-mt.so.3 #33 0x00002b1a51a437a8 in KApplication::notify () from /usr/lib/libkdecore.so.4 #34 0x00002b1a52085cc2 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3 #35 0x00002b1a520bea6d in QWidget::internalSetGeometry () from /usr/lib/libqt-mt.so.3 #36 0x00002b1a521915ac in QWidget::setGeometry () from /usr/lib/libqt-mt.so.3 #37 0x00002b1a522b566f in QWidgetStack::setChildGeometries () from /usr/lib/libqt-mt.so.3 #38 0x00002b1a522b5373 in QWidgetStack::resizeEvent () from /usr/lib/libqt-mt.so.3 #39 0x00002b1a5218c8ee in QWidget::event () from /usr/lib/libqt-mt.so.3 #40 0x00002b1a520f31d6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #41 0x00002b1a520f5a4a in QApplication::notify () from /usr/lib/libqt-mt.so.3 #42 0x00002b1a51a437a8 in KApplication::notify () from /usr/lib/libkdecore.so.4 #43 0x00002b1a52085cc2 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3 #44 0x00002b1a520bea6d in QWidget::internalSetGeometry () from /usr/lib/libqt-mt.so.3 #45 0x00002b1a521915ac in QWidget::setGeometry () from /usr/lib/libqt-mt.so.3 #46 0x00002b1a520ef119 in QWidgetItem::setGeometry () from /usr/lib/libqt-mt.so.3 #47 0x00002b1a5213e0a4 in QBoxLayout::setGeometry () from /usr/lib/libqt-mt.so.3 #48 0x00002b1a520ee248 in QLayout::eventFilter () from /usr/lib/libqt-mt.so.3 #49 0x00002b1a521572e1 in QObject::activate_filters () from /usr/lib/libqt-mt.so.3 #50 0x00002b1a5215735a in QObject::event () from /usr/lib/libqt-mt.so.3 #51 0x00002b1a5218c301 in QWidget::event () from /usr/lib/libqt-mt.so.3 #52 0x00002b1a520f31d6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #53 0x00002b1a520f5a4a in QApplication::notify () from /usr/lib/libqt-mt.so.3 #54 0x00002b1a51a437a8 in KApplication::notify () from /usr/lib/libkdecore.so.4 #55 0x00002b1a52085cc2 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3 #56 0x00002b1a520bea6d in QWidget::internalSetGeometry () from /usr/lib/libqt-mt.so.3 #57 0x00002b1a521915ac in QWidget::setGeometry () from /usr/lib/libqt-mt.so.3 #58 0x00002b1a520ef119 in QWidgetItem::setGeometry () from /usr/lib/libqt-mt.so.3 #59 0x00002b1a5213df75 in QBoxLayout::setGeometry () from /usr/lib/libqt-mt.so.3 #60 0x00002b1a5213e0a4 in QBoxLayout::setGeometry () from /usr/lib/libqt-mt.so.3 #61 0x00002b1a520eddcc in QLayout::activate () from /usr/lib/libqt-mt.so.3 #62 0x00002b1a520ee40f in QLayout::eventFilter () from /usr/lib/libqt-mt.so.3 #63 0x00002b1a521572e1 in QObject::activate_filters () from /usr/lib/libqt-mt.so.3 #64 0x00002b1a5215735a in QObject::event () from /usr/lib/libqt-mt.so.3 #65 0x00002b1a5218c301 in QWidget::event () from /usr/lib/libqt-mt.so.3 #66 0x00002b1a520f31d6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #67 0x00002b1a520f5a4a in QApplication::notify () from /usr/lib/libqt-mt.so.3 #68 0x00002b1a51a437a8 in KApplication::notify () from /usr/lib/libkdecore.so.4 #69 0x00002b1a52085cc2 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3 #70 0x00002b1a520f41ed in QApplication::sendPostedEvents () from /usr/lib/libqt-mt.so.3 #71 0x00002b1a520f42e5 in QApplication::sendPostedEvents () from /usr/lib/libqt-mt.so.3 #72 0x00002b1a52099338 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3 #73 0x00002b1a5210c67d in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3 #74 0x00002b1a520f4cec in QApplication::processEvents () from /usr/lib/libqt-mt.so.3 #75 0x00002b1a520f4d08 in QApplication::processEvents () from /usr/lib/libqt-mt.so.3 #76 0x0000000000455f25 in ?? () #77 0x0000000000458424 in ?? () #78 0x00002b1a5218ca52 in QWidget::event () from /usr/lib/libqt-mt.so.3 #79 0x00002b1a520f31d6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #80 0x00002b1a520f5a4a in QApplication::notify () from /usr/lib/libqt-mt.so.3 #81 0x00002b1a51a437a8 in KApplication::notify () from /usr/lib/libkdecore.so.4 #82 0x00002b1a52085cc2 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3 #83 0x00002b1a5218ed40 in QWidget::show () from /usr/lib/libqt-mt.so.3 #84 0x00000000004d1f58 in adept::ExtendableList::updateExtender () #85 0x00000000004d2b9f in ?? () #86 0x00000000004d2113 in ?? () #87 0x00002b1a5218ca52 in QWidget::event () from /usr/lib/libqt-mt.so.3 #88 0x00002b1a5147d68a in KListView::event () from /usr/lib/libkdeui.so.4 #89 0x00002b1a520f31d6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #90 0x00002b1a520f5a4a in QApplication::notify () from /usr/lib/libqt-mt.so.3 #91 0x00002b1a51a437a8 in KApplication::notify () from /usr/lib/libkdecore.so.4 #92 0x00002b1a52085cc2 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3 #93 0x00002b1a5218ed40 in QWidget::show () from /usr/lib/libqt-mt.so.3 #94 0x00002b1a5228927a in QScrollView::show () from /usr/lib/libqt-mt.so.3 #95 0x00002b1a52252b31 in QListView::show () from /usr/lib/libqt-mt.so.3 #96 0x00000000004d2229 in ?? () #97 0x00002b1a5218baf7 in QWidget::showChildren () from /usr/lib/libqt-mt.so.3 #98 0x00002b1a5218ecd5 in QWidget::show () from /usr/lib/libqt-mt.so.3 #99 0x00002b1a5218baf7 in QWidget::showChildren () from /usr/lib/libqt-mt.so.3 #100 0x00002b1a5218ecd5 in QWidget::show () from /usr/lib/libqt-mt.so.3 #101 0x00002b1a522b54e2 in QWidgetStack::show () from /usr/lib/libqt-mt.so.3 #102 0x00002b1a5218baf7 in QWidget::showChildren () from /usr/lib/libqt-mt.so.3 #103 0x00002b1a5218ecd5 in QWidget::show () from /usr/lib/libqt-mt.so.3 #104 0x00002b1a5218baf7 in QWidget::showChildren () from /usr/lib/libqt-mt.so.3 #105 0x00002b1a5218ecd5 in QWidget::show () from /usr/lib/libqt-mt.so.3 #106 0x00002b1a5218baf7 in QWidget::showChildren () from /usr/lib/libqt-mt.so.3 #107 0x00002b1a5218ecd5 in QWidget::show () from /usr/lib/libqt-mt.so.3 #108 0x00002b1a522b6069 in QWidgetStack::raiseWidget () from /usr/lib/libqt-mt.so.3 #109 0x0000000000437eb9 in ?? () #110 0x000000000043b948 in ?? () #111 0x00002b1a52157ce2 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3 #112 0x00002b1a5215887c in QObject::activate_signal () from /usr/lib/libqt-mt.so.3 #113 0x00002b1a524ce207 in QButton::clicked () from /usr/lib/libqt-mt.so.3 #114 0x00002b1a521f28bf in QButton::mouseReleaseEvent () from /usr/lib/libqt-mt.so.3 #115 0x00002b1a5218c410 in QWidget::event () from /usr/lib/libqt-mt.so.3 #116 0x00002b1a520f31d6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #117 0x00002b1a520f5334 in QApplication::notify () from /usr/lib/libqt-mt.so.3 #118 0x00002b1a51a437a8 in KApplication::notify () from /usr/lib/libkdecore.so.4 #119 0x00002b1a52085d34 in QApplication::sendSpontaneousEvent () from /usr/lib/libqt-mt.so.3 #120 0x00002b1a5208493e in QETWidget::translateMouseEvent () from /usr/lib/libqt-mt.so.3 #121 0x00002b1a52082b0a in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3 #122 0x00002b1a520993ea in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3 #123 0x00002b1a5210c70b in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3 #124 0x00002b1a5210c513 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3 #125 0x00002b1a520f4c9c in QApplication::exec () from /usr/lib/libqt-mt.so.3 #126 0x000000000043709c in ?? () #127 0x00002b1a50f678e4 in __libc_start_main () from /lib/libc.so.6 #128 0x0000000000436e29 in ?? () #129 0x00007fff5b2fd728 in ?? () #130 0x0000000000000000 in ?? ()