E stop only works when active high is set, which is wrong!

[amd7000]

Hi guys. I'm getting close to finishing my machine. Up until now everything works great, I've cut out a few bits etc. to test the machine. But I'm having problems now I've fitted my estop. It's a nc estop. When I set it to active low in the ports and pins menu the machine cant be reset in mach3 when the circuit is open or closed, but when I set it to active high it works but only when the switch is pressed so it works the wrong way round only.

The estop led is working correctly in the diagnostics, it turns on and off in active low and high mode, it just wont allow me to reset mach3 in active low mode when the estop is released. I'm using a z5pa bob which I'm thinking my be confusing matters. I'm using the machine with the estop pressed in at the moment. I've set my estop to port 1 and pin 15 as stated in the manual. Any ideas? Cheers