Thanks for the ideas guys but still no joy...

Tried the "manual" approach to running the driver
but still the same result - either complete lock up
or "Error in command name"...
Also checked for viri and nothing has shown up (thats
one good thing then...)
@red - have taken the set-up (almost) to pieces, and
everything is tight (but haven't clean anything). Thing
is the rest of the boards I have are working fine so its
looking more and more like a cv64/3d board (hardware)
or a CGX (software) problem.
Any way I can test the board without enabling the driver?
Thanks, ATB
Jason