I did some more testing tonight.
I reinstalled Mach 3 ( ver .062) and tested again. Same problem.
I slaved B axis to Z axis and the B axis worked fine. Z axis still faulty. ( so the Z axis signals just don't work on the Z axis outputs. )
I removed the ESS from the BOB to inspect. pins ok...nothing out of the ordinary.
It seems to me thats its more and more likely a problem with the BOB....
Steve