I noticed that if you have mumble running in the background some steam games wont open.. like Dota2 and arma 3.
Try closing your voip programs (mumble,TS,vent) and open the games. When the game is open the voip programs can be opened again..
I have been looking for a community in Europe that has mainly focused on Arma2/3, without luck.
Most of the communities are multi gaming and play BF3 & CoD. I'm looking for realism unit.
Could someone point me to sites that list Arma enthusiastic's or just point me straight to them :)