There is a non-deterministic bug in Port Zenith that me and several others encountered in Port Zenith in the warehouse map that contains the shipment of shield emitters that you are supposed to steal. If you are spotted while sneaking in stealth or carrying Bob's armor and keycard(when the guards say their dialogue), often the cursor will change to the spinning hourglass loading symbol and you will be unable to advance or do anything, including reload the game.
