My daughter was running Putt-Putt Travels Through Time (many such games run fine) and went to have dinner. When she returned the MBP screen was dimmed, and when she resumed play the sound was off. I tried everything, from suspending the VM to turning mac and xp and parallels sound on an off, and even rebooting the MBP. Finally gave up and shut down Windows, upon which is did play the Windows shutdown sound. I don't know if this had to do with DirectX or not. Also, upon rebooting and a VM power on, the game could not access the CD for some reason. I had to eject the CD and reload it.