Fedora 11 + KDE+ Sound Problem

[Micros50]

I recently installed Fedora 11 to replace fedora 6 which I had been
running until recently.  Thus far everything looks great. Except for a
few minor issues everything more or less worked fine.

My preferred desktop is KDE which also seemed to work well. The
transition from KDE 3 to KDE4 went smoothly.

However, I did run into a problem with regards to KDE sound apps. At
first they were running fine. Any apps that needed to access the KDE
sound system i.e. "k-notify", "juk", "Amarok", etc. were working fine
via the "phoneon-backend-xine" backend.

Then all of a sudden something changed and all kde apps that needed to
access the sound system started crashing and giving a Signal 6
(SIGABRT). I didn't recall making any changes or updates that would have
accounted for this problem.  Here is a copy of the backtrace that I was
getting each time an application crashed.

Application: JuK (juk), signal SIGABRT
[Current thread is 1 (Thread 0xb7f3b780 (LWP 3121))]

Thread 6 (Thread 0x9940b70 (LWP 3122)):
#0  0x00843416 in __kernel_vsyscall ()
#1  0x008162d2 in pthread_cond_timedwait@@GLIBC_2.3.2 ()
from /lib/libpthread.so.0
#2  0x05c4674d in ?? () from /usr/lib/libxine.so.1
#3  0x00811935 in start_thread () from /lib/libpthread.so.0
#4  0x0074693e in clone () from /lib/libc.so.6

Thread 5 (Thread 0xb66b1b70 (LWP 3123)):
[KCrash Handler]
#6  0x00843416 in __kernel_vsyscall ()
#7  0x006937c1 in raise () from /lib/libc.so.6
#8  0x00695092 in abort () from /lib/libc.so.6
#9  0x057fc84c in qt_message_output(QtMsgType, char const*) ()
from /usr/lib/libQtCore.so.4
#10 0x057fc92e in qFatal(char const*, ...) ()
from /usr/lib/libQtCore.so.4
#11 0x057fca25 in qt_assert(char const*, char const*, int) ()
from /usr/lib/libQtCore.so.4
#12 0x02c5b87f in Phonon::MediaSource::type() const ()
from /usr/lib/kde4/plugins/phonon_backend/phonon_xine.so
#13 0x02c5e255 in Phonon::MediaSource::type() const ()
from /usr/lib/kde4/plugins/phonon_backend/phonon_xine.so
#14 0x02c642a0 in Phonon::MediaSource::type() const ()
from /usr/lib/kde4/plugins/phonon_backend/phonon_xine.so
#15 0x0609a884 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib/libQtGui.so.4
#16 0x060a1f0e in QApplication::notify(QObject*, QEvent*) ()
from /usr/lib/libQtGui.so.4
:

Any ideas ?  It seems to be an issue with the "phoneon-backend-xine"
plugin so I switched from the xine backend to gstreamer and all of a
sudden everything started working again. I had to install some
additional gstreamer plugins but, at least now everything seems to be
working again with respect to the KDE sound system.

I guess we can say the problem is solved in as far as getting sound out
of my KDE apps but I am still puzzled as to what might have caused the
xine backend to start giving me problems. Wondering if I might need to
send a formal bug report. Any suggestions or insignts into this problem
are appreciated.

Thanks.

John