going from 10.12.3 to 10.12.4 introduced issues - scrambled popup windows

[tjgrant]

I've found for Parallels, if you go to "Configure" on the virtual machine, select the "Hardware" tab, go to "Graphics", click "Advanced Settings" and turn OFF "3D acceleration", that this seems to resolve issues for Parallels with a DisplayLink device. You can only make this change when the virtual machine is OFF, and you must make this change for each virtual machine.