Flash Player displays Flash game exe as white screen

Hi,

since yesterday each time I try to accsess a flash game exe (typical click-and-hit)  I only get a White Screen after the game opened. It worked just fine all the time before.  I first assumed the problem being the exe itself, but after various attempts (reinstalling etc.) it became clear that the problem isn´t the game itself.  Assuming it might be a bug due to a reccent update I installed it on an old pc with XP and manged to run it only to find out that the same problem surfaced after I shut the old pc down and turned it on again, which left me puzzled since as I said I assumed it might be a bug to a reccent bug.

So my question now is: Why did a flash exe that worked all the time before just displays a white screen now and is there a way to fix it?