Right now I am running the AMD Catalyst 14.12 drivers and GC3 is telling me that I need to update my drivers. The game loads just fine, but it's a big of a bug there.
4790K CPU, cooled by Cryorig R1 Ultimate
MSI Z87 XPower
AMD R9 290 GPU with 14.12 Catalyst drivers
32 GB G.Skill TridentX
Samsung SM843T 960GB SSD