Danje, Icon (and others by PM) thank you all for your help!!!
For what its worth I have now been able to get what appears to finally be a stable install of firmware 1.2 from 1001 copters. Will try to find the link as it seemed to be the only version of 1.2 that didn't result in a failed or buggy install.
I was fortunate? in that I had two skylines, two harnesses and a working skyline on a second bird. I troubleshot EVERYTHING, in every different combination. The answer?? Reinstalling software, try firmware upgrade, uninstall software, try firmware, uninstall software, FW, uninstall, FW...
Was it a bad harness, a bad connection, a bad servo, a bad harness, a bad skyline,m a bad servo?? NOPE - Just doing the same thing over and over expecting a different result (sounds familiar eh) BUT THAT WAS THE BLOODY ANSWER!
Didn't want to be this negative but that's not a solution!!
At least it's now functioning (did not say working) and I can now go back to trying to resolve the typical tuning issues on the AD6 and can start discovering the typical issues on the Jib.
The day a brushless comes out that can handle a DSLR+...