Quote Originally Posted by JAZZCNC View Post
The first question to ask is it a genuine UC100 from CNCdrive motion controls or was it bought from eBay.?

Next, I've seen this happen many times with various controllers, and often it's a corrupted Mach3 XML. Either create a new profile using the same settings or go into the XML backup folder and use an old one that you know worked. Personally I'd set up a new one.

Or better still invest in UCCNC as it's now much better than Mach3.
The UC100 was obtained from CNC4you and I am assured that it is the genuine article .
I dont have a problem with the £60 or so for a UCCNC licence but slight concern about familiarization with a new bit of software.
Will I find it easy to convert ?
Is there a trial option?