Found this on the phoebe mailing list:
' Sounds to me from
reading the bugticket like is yet another threading related bug inside
that 3rd party xmms plugin. Goes away if you use
Amazingly, the glx problem also disappears if you define this. I put it in /etc/X11/prefdm:
This makes the X server start.
Now you also need to put this in your .profile, otherwise any glx program you run wil also crash.