Screen locks but game still running
 

I have been trying different compatibility modes and running in windowed mode so I can tab out.

But sometimes the screen freezes but I can still hear the game running in the background.

Is there any settings of fixes? Thanks.

When that happens to me, ALT-Enter fixes it. But it also comes with a 5% chance of a ResetDevice() error that crashes me out.

There are various suggested fixes: compatibility settings, dgVoodoo installation etc. but nothing seems to be a foolproof solution.

Somehow in the past few months, I assume either P99 software changed or something external like a Windows update caused this to start happening to a lot of people when it never happened before.