I've found a repeatable problems with Draftsight 2020 x64 SP4 when I move the entire Draftsight application window from my right (Main) monitor's desktop to my left (Secondary) monitor's desktop under Windows 10. While the Draftsight main application window is in my left (Secondary) monitor's desktop, ESnapping doesn't work at all and lines act like they are being "drawn" but don't display. Dimensioning also acts like it's doing something but doesn't display any lines or text either. I haven't tested out much else beyond those things, but it's obvious that there is something not working correctly. When I move the Draftsight application window back to my right (Main) monitor's desktop, ESnap, lines and dimensions are visible and seem to work correctly again. Weird!  

I'm running Draftsight on a Ryzen 7 3700X, 32GB RAM, NVIDA GeForce RTX 2060 Super graphics adapter.