Everything else seems to work fine. The song I was using as a test for PD plays just fine if I double click on it. For example when viewing the library, scrolling to any song, double clicking plays it. If you highlight it, right click, select play (play with play doctor), the currently playing song stops, but that's it. MC looks like it normally does when nothing is playing. If you then choose something to play by any means other than play doctor, works just fine. Looking at that error message on line but nothing linked to my problem has come up yet.
Thanks
Larry