I am running Parallels 10 with Windows 7.1 64-bit in Full Screen mode under Yosemite. Starting about a week ago, I became unable to switch from Windows to Mac OS X by clicking on the OS X Finder icon. I tried it both from the Task bar (hold cursor at bottom of screen until it appears) or by Command + Tab. Neither can I switch from Windows to any other running Mac application. The feature isn't greyed out, it just doesn't work. There isn't even a flicker of the screen when I select Finder. I tried rebooting Windows & Mac to no avail. I also tried reinstalling Parallels Tools from the Actions menu at the top of the screen (displayed after I hold cursor at top of screen for a few seconds). If I change to Coherence (or use the View...Exit Full Screen mode from the Windows 7.1 menu at top of the screen), I can switch between Windows and OS X--but I lose precious real estate on my laptop for the title bar and OS X Task bar. If I change to Modality, I am still trapped in Windows, and cannot get an OS X screen to display. I prefer to run in Full Screen mode, but the inability to switch to a Mac OS X screen is driving me crazy.
Hi Byundt, Please try re-installing Parallels Tools, refer http://kb.parallels.com/4841 and check how it works.
After uninstalling and then reinstalling Parallels Tools, I can now switch between Windows and OS X. Thanks!
