I am running Mac OS X 10.8 on a Mac Pro with 24GB of RAM and 2TB hard drive. The machine has an ATI Radeon HD 5870 in it running an Apple Display and a 23" Samsung monitor. I am running Parallels 7.0.15104 (Revision 778994; July 10, 2012) and Windows 7 Ultimate on a 4TB internal two-disk striped RAID. I have Parallels running in Coherence and both Mac OS and Windows windows are behaving erratically. For example, if I am in Safari and then click on the Windows bar at the bottom of the screen, Parallels comes to the front, the blue Windows bar come to the front, and then the Safari window covers the Windows bar. Even if I click on Safari again and then Windows bar again, the Windows bar never comes to the front. In order to get the Windows bar to show all the way across the screen and be in front of every other window I need to go to the Parallels icon in the dock and click it. Then everything in the Windows VM comes to the front. Other strange windowing issues are occurring such as windows in Windows disappearing behind other Windows windows when you drag them. I cannot click a background window in Windows and get it to come to the foreground. Not sure if this is a known issue or isolated to just my machine. I have a MacBook Pro (late 2007) that I will also be using later today. If I experience a different result I will post that here.