We are running NXT-G, version 1.1 with firmware 1.05. Someone in our workshop wrote a 1-block program to make motor b,c go forward for 5 rotations. When the program runs, one motor stops spinning immediately - while the other continues to the full 5 rotations. We've switched the motors, the wires, the ports (changing the program accordingly), and even the NXT Bricks. None of these changes have resulted in the brick running the program properly.