I am running the dev edition it stil didn't work before the recent patch or before I had the dev edition. Also the first two showcases. "Infantry" and "Scuba" work fine through the whole game. I also have Arma 2 and OA and they work perfectly.
Here are my Arma 3 documents:
https://www.4shared.com/rar/JAUTbaOi/Arma_3.html?
My graphics card:
AMD R7770 Core Edition