Version:            (using KDE 4.1.3)
OS:                Linux
Installed from:    Ubuntu Packages

As soon as I install the nvidia accelerated graphics drivers (version 177, but I've tried others too with the same result), I get a kmix crash:

Application: KMix (kmix), signal SIGABRT
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[Thread debugging using libthread_db enabled]
[New Thread 0xb654a8d0 (LWP 5689)]
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[KCrash handler]
#6  0xb8083430 in __kernel_vsyscall ()
#7  0xb7ed3880 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb7ed5248 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb768f795 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb768f872 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb768f915 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb7a9f54a in ?? () from /usr/lib/libsolid.so.4
#13 0xb7a9f84f in ?? () from /usr/lib/libsolid.so.4
#14 0xb779ca60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb779d7e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0xb7ab1853 in ?? () from /usr/lib/libsolid.so.4
#17 0xb7ad746e in ?? () from /usr/lib/libsolid.so.4
#18 0xb7ad755a in ?? () from /usr/lib/libsolid.so.4
#19 0xb75f426e in ?? () from /usr/lib/libQtDBus.so.4
#20 0xb75fb627 in ?? () from /usr/lib/libQtDBus.so.4
#21 0xb7797771 in QObject::event () from /usr/lib/libQtCore.so.4
#22 0xb6dc58ec in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#23 0xb6dcd72e in QApplication::notify () from /usr/lib/libQtGui.so.4
#24 0xb7d09b2d in KApplication::notify () from /usr/lib/libkdeui.so.5
#25 0xb7787e61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#26 0xb7788ae5 in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#27 0xb7788cdd in QCoreApplication::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#28 0xb77b282f in ?? () from /usr/lib/libQtCore.so.4
#29 0xb676d6f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0xb6770da3 in ?? () from /usr/lib/libglib-2.0.so.0
#31 0xb6770f61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0xb77b2478 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#33 0xb6e5fea5 in ?? () from /usr/lib/libQtGui.so.4
#34 0xb778652a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#35 0xb77866ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#36 0xb7788da5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#37 0xb6dc5767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#38 0xb8018abb in kdemain () from /usr/lib/libkdeinit4_kmix.so
#39 0x080485a2 in _start ()
#0  0xb8083430 in __kernel_vsyscall ()