I'm using Parallels on OSx 10.6.5 and it's been working fine. Today I plugged in a USB device and Parallels asked me which OS I want it to assign the device to. The box then goes away about half a second later, never giving me enough time to respond. This process repeats every thirty seconds. I've quit Parallels and started it up again. I've exited Coherence mode. I've unplugged and replugged the device. I've minimized all windows. Any thoughts?