No problem here either. I did have to make a neutral-ground bonding adapter after installing the Progressive Industries EMS for it to work.
Per Champion Manual:
"Grounding
The generator system ground connects the frame to the ground terminals on the power panel.
– The generator (stator winding) is isolated from the frame and from the AC receptacle ground pin.
– Electrical devices that require a grounded receptacle pin connection will not function if the receptacle ground pin is not functional, unless the neutral wire is bonded to the frame."