Yeah as others mentioned this was reported early on in SU10 beta for a lot of people.
I have see it mentioned somewhere else that some people impacted by this had done a registry edit previously to try and improve performance in the Sim. Obviously no idea if that is the case here but some state they fixed it by restoring their backed up registry. Take with pinch of salt as it worked fine for me always in the Beta but then I never did a registry hack so who knows.
OK someone I know tried it doing this. Before doing anything back up your registry I cant stress that enough. This is what they said.
I had both registry tweaks active. Reverted only the one, where you add “TRDLevel=0” in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers (Key TDRLevel deleted) and now it works.
Reboot PC after the edit