Definitely DX9… nothing has changed from when it worked fine, aside from now I’m using the runtime switcher. Game loads up everything is fine…the crash happens as soon as you start a game and the load screen would come up.
Checked it right away yersterday evening (Steam GOTY edition with the latest vorpX build). I experienced one crash during a loading phase, but that seemed more or less random and didn’t happen again afterwards. If it worked before, maybe it’s an issue with the runtime side by side configuration.
You might want to wait a little anyway. While being at it I fixed a few shader glitches and the messed up menu yesterday.