I have a 5075e with the power reverser. I find at times I'll have everything in gear, including the power reverser, and the N light will be lit up and the tractor won't move when I let out the clutch. This usually happens if I shift things quickly. I just shift the power reverser back to neutral, then back to whatever direction I want to go, and the tractor will move. Works every time for me. Hope this helps.