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.
I took your advice on this Jazz and was quite happy with what I got until this week .
I lost my licence as a result of a crash and having to reinstall Windows .
UCCNC license disappeared too . I have asked them to resend email and two days later with much discussion on CNCdrive forum I am no further forward .
As I said there it is like buying a new car and finding yourself calling for help from manufacturer then getting ignored .

I am in no way trying to blame you jazz but just noting that while their software looks good their customer support can be second rate .
This seems to be borne out by some reviews .