Ok, this is really strange. I use Parallels in "Space 2" on my mac. If flip to my guest OS (using full screen mode), when I return to "space 1", I can no longer minimize my applications. The yellow minimize button is grayed out. At first, I thought this was just a firefox problem but I've now tested it on many host apps. It does not appear to happen on applications that I've allowed in "both" spaces but this may require more testing. It's driving me nuts.
Posts identifying the same issue. http://forum.parallels.com/showthread.php?t=32039 http://discussions.apple.com/thread.jspa?messageID=8860377#8860377
Thank you, Our Developers are aware about this issue and are working to resolve it. At meantime, please, use the following workaround: If to use F8 button and then switch between spaces with arrows or mouse minimize button stays active.