I purchased Parallels back Sept 2006. Upgraded through versions 2.5, 3, 4, 5, and now 6. I've generally been very happy with it. I upgraded to Parallels Desktop 6 for Mac yesterday though, and I've already had Vista hang on me 3 times. I get the little Windows spinning circle and it won't respond. Mac Activity monitor shows pri_vm_app sucking up a bunch of CPU, but I can't get it to do anything. Won't restart. Won't shutdown. I wind up having to reset the VM and it's been more and more unhappy after each reset. Any known-issues or anyone seeing something similar?