Parallels has been shutting down on me frequently lately. I get no errors in OSX that I can see, and nothing in the Windows event log to indicate that anything has gone wrong. It never happens when I'm actively using Parallels, only when I return to my computer after waking it up--Parallels has just shut down. I should mention that I never actually put the computer to Sleep as I want SSH to be available all the time. When I say I wake it up, it's only the monitor that shuts off. To be clear, here are my power settings: Put the computer to sleep: never Put the display to sleep: 15 min Put the hard disks to sleep: checked I'm using an iMac 20" C2D 2.16, 2 GB RAM, OS 10.4.8. I have a second monitor on the mini-DVI port. Don't know if that's relevant, but I thought I should mention it. I'm running Parallels with WinXP Pro in Coherence mode. One last point--I had the same problem with 3106. I was hoping that 3120 would fix it, but no such luck.