I can't seem to get the Operator Pro to run the par 64's that are hooked to my dimmer paks for the pars. The paks light up appropriately but the lights do not respond on or off to the controller.
I'm connected to a dmx light fixture first and then to the paks. The controller is supposed to be able to handle both intelligent lighting and cans.
Help. Using xlr mic cable (short run) for now but understand I should use twisted pair wiring. Really much difference?

Yes the types of cables do make a difference.

You may be best served buy contacting Elation's tech support:

Elation Professional - Professional Lighting Products