Hello Brian,
Yes I know. Did you try to simulate milling (you will see diferences in feed rates)?
However, here is workaround. You have to create configuration file in older Mach3 version (R2.2). Put new configuration file to the folder of the new Mach3 (R2.41). In this case everything works as expected.
Looks there are differences in interpretation of the configuration files.
Thanks,
Petr