I recently upgraded to Parallels 12 and everything appeared normal. I then recently installed Parallel Toolbox and Windows appears to be trashed. The screen in black and I can't open any programs. What can I do??
Hello,
Parallels Toolbox is independent application and can't affect Parallels Desktop behavior.
Try
step 1: quit from all running Parallels Toolbox tools
step 2: quit from Parallels Toolbox
step 3: check your issue with Parallels Desktop. Does the problem still exist?