seems that something's changed with newer xmms pipe handling, but wmusic-1.4.11-alt1 would consume max CPU if xmms which it was talking to exits. observed on both "bare" and alt1..5 builds of xmms-1.2.8. may be an xmms bug...
please test 1.4.12-alt1
not fixed :( in fact, as gkrellm/kde plugins get stuck too, seems like XMMS problem.
fixed in xmms-1.2.10 (upstream).