I am getting this regularly, details as follows:
Drivers: AMD Crimson 15.11
GPU: ASUS Strix Direct CU III AMD Fury
Monitor: BenQ XL2730Z Monitor
Game: Rebel Galaxy
I can confirm everything works if I disable Freesync.
I'm going to try the 15.11.1 CCC Beta drivers to see if they resolve it.
I can confirm that the issue is resolved when using the 15.11.1 CCC beta drivers. For now I can use those, however I would like to use Crimson at some stage as the interface is nicer/more intuitive.