The brain of the human operator. Cybernetic devices depend on the hardware (the physical pieces of the device), the software (the programmed instructions) and the jellyware (the person who pushes the buttons and his decision-making.)
The machine checks out fine, and there are no glitches in the code. The problem is your jellyware - the guy who sits in the control seat clicks OK after every prompt.
1: An incredibly slow elevator that is in fact a giant jellyfish. The first known jellyvator appeared in World of Warcraft's five-man dungeon, Throne of Tides.
Man - have you played Throne of Tides yet? The jellyvator takes like five minutes a round trip! Good thing they put in a teleporter.