If full auto works then you have a ground problem it is single ended do you have one scan amp or two I took the dmx board out and rewired jeff
Yep. In the end, it was the ILDA cable. There was a whole tub of them at work.
Sorry for the very late reply, I moved house and had no internet for a while.
Happened to me on a gig once... Except I couldn't get to the ILDA cable that was at fault, so I just had squashed projectors for a while. Took the cable down, checked it out, sure enough the X+ pin was broken clean off.
Learnt to always check ILDA pins on male ends before any gig. :P