[kwackers]

I expect I'll end up reprogramming the Pic, or buying another, but I have a job set up on the mill and wondered if perhaps Steve could comment based on his knowledge of the firmware. I did look for a way to reset everything in the hopes that everything would come back but I can't find one.

I haven't checked but I think the version of the firmware you're using has "Set Worm Ratio" rather than "Steps for 360".
If so then it assumes a 400 step motor such that a 90:1 ratio would give you 90*400 = 36000 - which is the value you'd enter in the later version of the firmware.

I changed it because setting the number of steps is more flexible and it's obvious if you exceed the limits (entering 180 as a ratio gives the false impression that it's valid when in fact it internally overflows since 180*400 = 72000 which is greater than the max value of 65535).