About two days ago my VM started spontaneously switching from coherence to window mode. I wasn't working with any applications, it was just sitting there in coherence. I don't get any error message. Each time it happens i switch it back to coherence and it will stay there for a while but at some point it switches back to window mode. I'm running Windows 7 Home Premium 32bit guest OS on Mac OSX 10.6.7. I have the latest Parallels Desktop and tools installed. Has anyone seen this behavior or have any suggestions?