I have been testing a new version of the plugin that puts FRO back to Mach control and it works extremely well, there is a problem when the FRO goes too low, somewhere below 10% and it was found to be a Mach/SS problem. I have also tested a new version of Mach and this problem has been cured. Hopefully these will be released soon.
Hood
What was the problem?
I found that changing Feedrate while running can cause a stall. Actually just playing with the MDI and toying with the Feedrate you can hear jerks in the motor. It seems to temporarily accept feedrates over 100%, surges forward, then surges back to 100%. Somewhere in there it must be forgetting the acceleration limits too to make that stall.