I'm using a Gatton CNC with Mach3, Xylotex Plug and Play, and UC100. I am using Windows 7 on a desk top (originally started with Windows 10 on a lap top but still have the following problem). When I enable my limit and homing switches, E-stop and touch plate in ports and pins, I get lights illuminating on the diagnostics screen in Mach3 even though none of the switches are connected. If I enable the active low in ports and pins the lights go out, again even though the switches aren't wired. I disable the active low boxes and the lights come back on. Could there be a problem with the UC100?