Okay, this is gonna be a long one...
The version of HS : 2,7,0,9166 (Europe as well).
All my steps - turn on uMod as administrator (global hook checked and Hearthstone is added from program files/hearthstone/hearthstone.exe)->Turn on Bnet -> Launch HS
uMod folder is 3.49 MB (3.51 on disc). uMod.exe is 3.09 MB
View attachment 25226
P.S. I have tried doing as you said : Choosing high graphics in options and then turning HS off,restart Bnet, turn on HS. Did not help :/
Edit: I have also tried it on windows 8.1 and I got the same problem. It's really weird, makes me think that I did something wrong. Weirdest part is it used to work on perfectly fine. Both have AMD cards so if they updated that actually just might be the case. :/