Just got to the part of the "Watchers" mission where I'm supposed to shut down the security system for Mapes. I've killed all the soldiers, gotten to the security room, and I see the "Activate" button... but it doesn't do anything. I walk up to it, and there's no prompt to interact, and pressing F does nothing. I've looked around on Google but can't find any references to this glitch. Has anyone else experienced it? I'm enjoying replaying the game so far, and would really hate to just get stuck here. Don't really want to replay the whole mission either, in the hopes that maybe it'd work the second time through.

EDIT-- Not sure what caused the problem, but I tried just reloading from the checkpoint (right when I met Mapes), got through the one fight outside the security room, and when I got to the security room again, the button was working. Don't know what the problem was, but glad the solution wasn't too time consuming.