Another Windows 8.1 post upgrade issue.
When launching F1 2013, from Steam or desktop shortcut I get a "Program Already running" error.
Not much on any of the forums or Google search.
However the fix seemed to be quite a simple one. It took a 'verify integrity of the game cache' to get it working again.
All seems fine, but I think there may be issues with Nvidia and Windows 8.1 too.
12 Laps into a classic race and as I finally got into a position to overtake for the lead the screen locked up completely before going blank. A few seconds later I was still getting Audio feedback and I was getting haptic feedback from the steering wheel so I guess the game engine was still working fine.
I'm guessing we are going to need a new set of drivers from NVidia soon to clear down some of these Windows 8.1 glitches.