The PMDX-411 has been tested and runs fine with build 3390 of Mach4. Something in
your profile must have gotten stepped on. If you want assistance, please provide
a copy of your "Packaged Profile" either here or as a private email to PMDX.
You can generate the Packaged Profile in Mach4 using HELP > Support > Generate Packaged Profile.
Be sure to do this while running the profile of interest.