Game breaking glitch: can't break vent to enter taco bell

[Scuzzlebutt]

So I'm in the mission where Randy wants me to break into the "taco bell".  I got past the two front guards, dispatched the next guard by electrocuting him, and used the alien probe to warp onto teh room.  However, when I go to smash open the vent, nothing happens.  I've tried different weapons, leaving the area and coming back, and exiting the game and restarting it.  Nothing seems to work.  Please help!