I am running Parallels Desktop 6 on a 2011 iMac with a Windows 7 client. I have recently switched from PC to Mac, and I still depend on running Microsoft Office have 2 external monitors connected to the iMac so I want to use Coherence to allow multiple Windows windows. My problem is that after a period of not using a Windows program Parallels switches out of Coherence mode and all the windows pile up on the one monitor inside a Windows instance. Is this a Parallels feature or a bug? I can't find any preference or configuration option that bears on the problem. (Incidentally, it's just happened again...)