OK - I deleted the files from the PLUGIN folder, the re-installed the UC plugins and deleted the ones I know I don't need (UC100, UC200 & UC300) Now I can get Mach3 open without any popup warnings, but it's still not responsive. I have 2 shortcuts on my desktop. One opens Mach3 and I can't even turn off the flashing RESET button. The other shortcut opens and I can turn off/on the RESET & JOG buttons, but it's not responsive to the X,Y,Z arrows - everything just sits at 0. I think we're gaining on it, Please let me know if you have any more suggestions. Thank you!!!