AppServer crash: HDA Driver + Restarting Media Services + playing with Media Preflet

[mmadia]

hrev31435-x86gcc2 native. Recently switched to a different AMD box, contains one of the recognized and non-audio producing HDA chipsets. After restarting Media Services via the Media preflet, clicking on any of the nodes in the left most panel(correct term?) will result in a large white box displaying on the main view. Repeatedly switching nodes will cause that white region to grow many times the size of the screen. Eventually, this will lead to a gdb in app_server. I was able to reproduce this twice.

device Multimedia controller (Audio device) [4|3|0]
  vendor 10de: nVidia Corporation
  device 03f0: MCP61 High Definition Audio

screenshot of gdb attached. I'm uncertain which component this should be -- preferences/media, drivers/audio/hda, or servers/app_server.

[mmadia]

Cannot reproduce in hrev45285.