Sorry for hijacking your report, but I'm having very similar issues, I think.

With dx9, when entering "The Doman Enclave", the game gets stuck in the loading screen forever.
With dx11, the game outright crashes. Initially I was getting an message box with a dx11 stack trace, after a full reinstall the game just exits to desktop with no error message whatsoever.

I'm going through the thread OP posted to see if something there helps, but I think I've already tried almost everything too, even running with the Intel integrated graphics.