Not so much Drivers, but a couple of VST issues I've run in to.
The excellent ME80 VSTi from
http://www.memorymoon.com/me80.htm isn't recognised, either 64bit or 32bit.
And, ValhallaRoom 64bit isn't recognised, although oddly enough, the 32bit version is.
I've contacted both vendors, but I'd be interested if anyone else has had problems with these, especially the 64bit version of ValhallaRoom