Mine wouldnt fold either. Found out the WU's arent being friendly with CPU's set to a prime #. mine was default -1 which made it run at 7. I changed it to 6, works great.
Also just FYI the new Nvidia 375 series drivers wont work either. IDK if thats just on pascal, but I know it stands true with Pascal. I Changed to the previous driverset, upon suggestion of a F@H moderator. And it fixed my GTX 1070 not folding issue.
If i'm repeating info already on here sorry,