Hi all, I'm posting this problem under the educational forum as I'm using the Home Learning 2021 software. The problem occurs when not just when I hit the "RUN" key on machine simulation, but when I try to enter the "Options" for machine simulation. It initially worked pretty well, but then started to happen today for no real good reason. My machine should be up to par, as its a i7 - 10700 CPU @ 2.9 Ghz, with 8 cores. I have 16 gig of ram and I'm using a GeForce RTX 2060 Super video card with 8 gig of ram. I have no pending widows updates, and I don't believe it had any recently. I made sure that Mastercam is setup to use the card under "Manage 3d Settings", but it did not help. Anyone have any suggestions on what to try next?