This is the second posting on the same problem that I thought had been resolved., But it’s not.  

I’ve narrowed it down to something that I believe might be causing Mach3 not to work. 

Configuration: windowsXP, PMDX122 parallel port motion controller, Taig desk top mill. 

Been running this configuration for years and all of a sudden it quit working. 

Tried lots of things to get it running again, with no success. 

Here is something I think is unusual that may lead to the solution .

When I run the diagnostics with Mach3 and I click on the “mist toggle“, the red  light on output #4 flashes on and off. See attached photo. 

This should not happen since I do not have output # 4 enabled in the “output list”, see attached photo. 

Any suggestions would be greatly appreciated,

Chuck