It is possible that one of your mods caused this problem. Simply removing the override folder removed the mod, but the damage was already done to the game.
I know this might sound stupid, but you could try to warp past this particular room on the Endar Spire into the next one. This might cause problems later though...I've never tried to do that on the Endar Spire before. Except for uninstallation, this should be a last resort as warping can mess up the game (not the whole game, just the playthrough that you used it on.
It sounds like you might have to reinstall the game