I don't know - I have just tried enabling "enable" on both my Mill Screen and Lathe screen and both worked OK. I am trying this on my "office" computer - not in the workshop.
However on both my screens (1024.set and 1024.lset) only three of my enable leds lit up out of the six, even with all enabled.
I tried active high and active low - but it made no difference to anything. The leds were still lit (or not)
There was one thing I did notice and that was the settings were common to both set and lset, so whatever I had set on the mill transferred to the lathe when I changed the screen. Are you trying to get different settings on different screens???