AMD decided to leave no helpful information whatsoever and said that it is not a known issue, though i believe it is as I already reported it.
Just revert to the old catalyst control center. You are very fortunate to have mainstream support for your video card for so long. Can you use GPU-Z to make 100% certain your video card is indeed a 7700? If you have even a slightly lower model, it would not be supported.
Tried a few more times, and found that my APU was not supported on the 15.12 catalyst, but was on 15.11 and it caused confusion in this thread - I'm completing my Skylake PC Wednesday anyway.