I've a Panasonic HD Plasma TV and ASUS VW222 montor. Until the 15.7 update I had a solid Dual display setup.
I reverted back to 14.4 as there was no way to reconfigure to get 15.7 to work.
Thinking that there may be a conflict in settings between the OS and AMD, I also tried it on the Linux MINT OS with the same results.
It was broken before release...way to go Software Quality.