I am running 10.9.2 on a 2.2 GHz intel with 4GB of RAM. When launching a game (specifically, Insurgency), I receive a message stating that "The in-game Steam overlay requires access for assistive devices to be enabled. To enable to (sic) the in-game overlay, open the Security and Privacy > Privacy preference pane and allow access for Steam." It provides a link to launch my privacy settings in my System Preferences, however there is no option to add Steam as an assistive device. Due to this issue, I'm unable to use the Steam overlay in-game. I didn't find much following a google search or searching these forums aside from suggesting I enable the beta, which I have. I have also rebooted my computer and application, so there's that as well. Maybe I need to uninstall and reinstall?
On a side note, I am also having problems joining servers which my friends say have slots open, but to me it appears (and acts as if it's) full. Again, this in reference to Insurgency specifically. Any help would be appreciated.