I have used Power Tracks for years but now it is displaying some unusual behavior. Once loaded it works well. But once it has been running awhile and I hit the play button the following behaviors occur..

The play button changes color and freezes. The time line ruler advances a bit and freezes. No sound on either audio or midi tracks. The audio meter bar in the tracks view moves as if the audio is playing but no sound. Program cannot be shut down in task manager. Ending process ptw.exe*32 in system processes may cause blue screen. Everything works fine again on restart of computer until at some pint it will freeze again. This Power Tracks Pro 12 running on Windows 7 Home 64 bit