@Jim Wilson
Hello everybody, I am experiencing the same issue on my Vectorworks 2019 on Windows if I set navigation graphics to "best performance". The only way to avoid it is with "good performance and compatibility".
I am using two monitors, I will try to unplug one and see if it changes but the same happens to my colleague who is only using one display.
We both just clean installed Vectorworks 2019 (although we have older versions installed on the same computer).
Any help would be appreciated