I am using Eagle version 7.2.0 and pcb-gcode version 3.6.2.4. Here are my settings. Your mileage may vary.
I think the “Use Simple Drill Code” eliminated my G82 problem.
The PCB milling bit I used was a EM2E8-0945-30VC from:
http://www.precisebits.com/products/carbidebits/scoreengrave.asp
Flipping the board to mill the other side would be a lot easier if I knew how to drill a registration hole at 0,0. Maybe I can just measure the offset from 0,0 of a drilled hole near 0,0, flip the board, and use that as a way to locate 0,0 on the bottom of the board?
Dave