Playing thru the mission, I first thought the door codes weren't working properly as all I saw was a black wall. Oddly, it seems as though when the door opens, it is replaced with a black texture. You can walk thru it, but you can't see thru it, and the guards outside can't see in. Does anyone know if this is a specific bug with my video card, or if there is a fix for it? Not game breaking, and I've already passed the mission, but didn't know if it would have a similar issue later on in the game that I might not realize is an open doorway.

somebody patched up and didn't restart their current mission (by hitting the restart button in the menu)..

I could have sworn I did all the patch installs before I started the game. Restarting the mission cleared it up though, so I must not have. Thanks Voodoo47!