I've modified the usual touchplate macro to use the special commands which CS Labs provide for this purpose in place of the usual g31. I've also written macros (or modified someone else's - can't remember now) to do tool height sensing for second-operation tool changes, which means that they have to work reliably during an M6 tool change. I had a lot of problems until I went back to an earlier version of Mach3. I have also tweaked the first of these macros for touch-off in x and y, both directions. I used these when initially setting up the machine although I don't use them day-to-day but I'm guessing that these are the kind of problem areas that Gerry is talking about.

However, given that there are some internal problems between the CS Labs side and Mach3, it does look as if you need to check that the functions you want do work. I've steered clear of add-in screensets partly for this reason. At least I have full visibility of what my own code does and I carry the can for anything that doesn't!