I just updated Mac OS to 10.12.4 from 10.12.2, I updated Parallels to 12.2.0. I have a Windows7 Parallels vm that I run in coherence mode on a MacBook Pro-Retina with two external monitors via displaylink usb adapters. When I move a Windows7 windows to one of the external displays the video for the window appears to not 'sync' all that I see are small horizontal/diagonal lines inside a rectangle. The window does move and size, but nothing inside of it can be recognized. If I drag the window back to the Mac display, it looks fine. Where do I even start to be able to fix this Ron.
