Medman007, OK then I will not investigate the issue.
Rob, The UC100 plugin is compatible with all Mach3 R3 versions. There are different bugs in different Mach3 versions is another thing, but we have no notes about which Mach3 version contains what bugs, so it would be hard for us to make a list. We know about a few of them in different versions, but never made a list of them.
Another thing is that the UC100 plugin was not modified about a year now, because people not reporting bugs about it anymore, probably because it became bugfree already.
What we receive reports (not too many though) about issues always finally comes down to a bug in a particular Mach3 version and these always resolved when people trying to install different Mach3 versions.