[calimocho]

A little update: it appears to have started working. Maybe the OP can try some/all of this. This is all I have done between it working and not working.

I nothing but the media player from WMP to Audio manager. Hit save, it spun and spun... waited ~5min and soft reset. I noticed it HAD actually changed the media player. Disabled HTC Home plugin (which I *had* tried before, unsuccessfully). Went back in, hit the cartoon theme, load, save, and it just worked in a blink. Maybe it was loading the theme that jiggered some settings in the reg that were having trouble before?