Hola Juan G.
Mira lo que he encontrado al respecto:
https://bugs.launchpad.net/ubuntu/+source/xmms/+bug/58192donde dice:
This bug has also been reported upstream:
http://bugs.xmms.org/show_bug.cgi?id=1907
(Launchpad does not currently do upstream links to xmms bugzilla). Poor
interaction between gdk1 and composite that causes crashes and weird
behavior when double-size is enabled. I can also verify that setting
XLIB_SKIP_ARGB_VISUALS=1 (or disabling double-size) makes the problem go away.
y más abajo:
The solution given in bug #63144: "Clicking on the double size button crashes XMMS";
export XLIB_SKIP_ARGB_VISUALS=1
solves my problem. I then can run xmms without any problems
Saludos.