Version:           3.0 (using KDE 4.1.2)
OS:                Linux
Installed from:    Ubuntu Packages

kmix crashes when i plug in a USB Audio interface. 
Attached is the dump it created.

Qt: 4.4.3
KDE: 4.1.2
KMix: 3.0

dmesg:

[270483.296135] usb 4-1: new full speed USB device using uhci_hcd and address 3
[270483.522123] usb 4-1: configuration #1 chosen from 1 choice
[270483.623387] input: Plantronics Plantronics Headset as /devices/pci0000:00/0000:00:1d.3/usb4/4-1/4-1:1.3/input/input11
[270483.632344] input,hidraw0: USB HID v1.00 Device [Plantronics Plantronics Headset] on usb-0000:00:1d.3-1



Backtrace: 

Application: KMix (kmix), signal SIGABRT
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb64f78d0 (LWP 14096)]
[KCrash handler]
#6  0xb803c430 in __kernel_vsyscall ()
#7  0xb7e7f880 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb7e81248 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb763c795 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb763c872 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb763c915 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb7a4c57a in Solid::DeviceManagerPrivate::_k_deviceAdded (
    this=0x8d96080, udi=@0x8f6cea8)
    at /build/buildd/kde4libs-4.1.2/solid/solid/devicemanager.cpp:164
#13 0xb7a4c87f in Solid::DeviceManagerPrivate::qt_metacall (this=0x8d96080, 
    _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbf83cbfc)
    at /build/buildd/kde4libs-4.1.2/obj-i486-linux-gnu/solid/solid/devicemanager_p.moc:72
#14 0xb7749a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb774a7e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0xb7a5e883 in Solid::Ifaces::DeviceManager::deviceAdded (this=0x8daacd8, 
    _t1=@0x8f6cea8)
    at /build/buildd/kde4libs-4.1.2/obj-i486-linux-gnu/solid/solid/ifaces/devicemanager.moc:79
#17 0xb7a8449e in Solid::Backends::Hal::HalManager::slotDeviceAdded (
    this=0x8daacd8, udi=@0x8f6cea8)
    at /build/buildd/kde4libs-4.1.2/solid/solid/backends/hal/halmanager.cpp:214
#18 0xb7a8458a in Solid::Backends::Hal::HalManager::qt_metacall (
    this=0x8daacd8, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbf83cdb8)
    at /build/buildd/kde4libs-4.1.2/obj-i486-linux-gnu/solid/solid/backends/hal/halmanager.moc:70
#19 0xb75a126e in ?? () from /usr/lib/libQtDBus.so.4
#20 0xb75a8627 in ?? () from /usr/lib/libQtDBus.so.4
#21 0xb7744771 in QObject::event () from /usr/lib/libQtCore.so.4
#22 0xb6d728ec in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#23 0xb6d7a76e in QApplication::notify () from /usr/lib/libQtGui.so.4
#24 0xb7cb672d in KApplication::notify (this=0x8c673f0, receiver=0x8daacd8, 
    event=0x8db7cd8)
    at /build/buildd/kde4libs-4.1.2/kdeui/kernel/kapplication.cpp:311
#25 0xb7734e61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#26 0xb7735ae5 in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#27 0xb7735cdd in QCoreApplication::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#28 0xb775f82f in ?? () from /usr/lib/libQtCore.so.4
#29 0xb671a6f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0xb671dda3 in ?? () from /usr/lib/libglib-2.0.so.0
#31 0xb671df61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0xb775f478 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#33 0xb6e0cee5 in ?? () from /usr/lib/libQtGui.so.4
#34 0xb773352a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#35 0xb77336ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#36 0xb7735da5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#37 0xb6d72767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#38 0xb7fc4abb in kdemain () from /usr/lib/libkdeinit4_kmix.so
#39 0x080485a2 in _start ()
#0  0xb803c430 in __kernel_vsyscall ()