I remember always having issues with Arma 2 when using the steam overlay, the controls would lock up and this makes me have to alt tab or restart the game to fix the issue.
I get the same exact issue in Arma 3, seeing as Steam is meant to be integrated is there any word on when the actual overlay will work with the game? Having to alt tab to talk to people is a bit of a pain...
Thanks,
Rexy