Parallels 14 - multiple monitor issue

Hi,

I have had this particular issue with previous versions of parallels, but the latest release is by far the worst!

I have a Mac Pro (Late 2013) with 96GB RAM, 4 attached displays:

https://www.dropbox.com/s/3xftguzm9fe8du4/Screenshot 2018-10-01 10.24.39.png?dl=0
https://www.dropbox.com/s/94x0g7xn1evhfk0/Screenshot 2018-10-01 10.24.53.png?dl=0

When running VMs in coherence mode, frequently Mac OS windows will appear on top of the guest OS windows. In the past waiting a few moments, would bring the guest OS window back, but now I have to minimize the Mac OS windows (there may be more than one now on top of the guest OS window) . This is very very annoying - anyone have any ideas? Trying to capture video of this is difficult as it is very intermittent.

Thanks,

James.