debugging xmms

Hi I am xmms user who needs help debugging xmms

My system is Gentoo Linux. I installed xmms on it and it was working and
then one day after I updated my system with new packages, xmms stopped
working. I tried various things including reinstalling all the
dependencies of xmms upto glibc. but nothing worked. 
Right now I can stil play mp3s using mpg123 but xmms is simply not
strting.
the error I get is this
Available CPU flags: <list of a lot of cpu flags)

Then I tried to debug xmms in debug window.
xmms opened 4 threads and then one of the threads segfaulted and the
xmms switched to another thread which went in to event loop.
So over here there are 2 things.... if the error above sounds familiar
then could you please tell me how to fix it. Or other wise I wanted to
see the backtrace of the segfaulted thread... can anybody tell me how to
switch to that thread..... I will appreciate any other tips about
debugging multi threaded application in general or about debugging xmms.

Thanx a lot
Spundun