arts in kde >3.2.0 uses uses gthread 2, from glib 2
xmms uses gtk1 from glib 1
you can't use glib 1 and 2 at the same time.
So you'll have to wait for xmms 2 (later this year)
Until then you can use beep media player which is xmms compatible and doesn't use gtk1.
Try the mandrake mailing lists, I imagine they are getting a lot of mails on this.