Hey there friends,
Thanks for working hard to find an answer for this. Something to try that we have seen success with is forcing windowed mode for classic.
- Go to Blizzard Battle.net Desktop App WoW tab
- Select Game Settings from Option dropdown
- in Game Settings, activate the option “Additional command line argument.” Type in:
-windowed
Just chiming in to help out if we can.
/Nathardrick