I have the same Problem. My Anniversary Update was last Sunday...yesterday i want to stream and i have only FPS Drops from normaly 300-500 down to 25-100...in CS:GO, just only when i start the OBS Studio Software...i was so crazy, that i go back to an earlier win 10 version (build 10586) but its the same prob. i hope u understand me, cause im a german streamer :D