In El Capitain and Sierra with Parallels 11 & 12 OSX Screen Grab shift-control-cmd-4 cause right mouse button stick in windows guest. In other words do a OS X screen grab and go back to the windows guest and when you left click the context menus (right mouse click come up). I have to minimize the guest VM and then open to make it stop. Happens with Windows 7 and 10.
Hi StephenG4, if you want to minimize the guest VM(To exit Full Screen mode), do one of the following: Move the pointer to the top of the screen until the MacOS menu bar appears and click View > Exit Full Screen or Press Command-Control-F. Please share the screenshot of the keyboard shortcuts assigned to OS X virtual machine and Mission Control settings on Mac Host so that we could help regarding the exact operation of Shift+Control+Cmd+4
This has nothing to do with minimizing the window. Again when you the vm is running, and you move to OS X an you do an OS X screen grab (key combo shift-control-cmd-4) of anything and then GO BACK to the windows vm and click on anything in windows the left mouse click are being interpreted as right mouse click which brings up the window context menu for the item you click on, start menu, outlook email, etc etc. The only way to then get the mouse working correctly again in windows is to minimize and then maximize the windows vm. This happens on newly created windows 7 & 10 vm's, vm's that were upgraded from windows 7 to 10, windows vm that were installed in Parallels 11, windows vm that were installed in Parallels 12 and windows vm that started in Parallels 11 to 12. This has been a consistent problems from day 1 with Parallels on OS X Yosemite, EL Capitan and now Sierra.