I tried using the search but it seems something is broke and I keep getting brought back to the forum index.
I am using the Return to Zero button and it works as expected but pops a "Axis 0 error while disabled"
This contraption has only 3 axis. All rotary. They are set up Axis 0 =A, Axis 1=B and Axis 2=C. So far running from MDI works as expected. The return to Zero does not.
---------------------------------------------------------------
-- Go To Work Zero() function.
---------------------------------------------------------------
function GoToWorkZero()
    mc.mcCntlMdiExecute(inst, "G00 A0 B0 C0")--Without Z moves
    --mc.mcCntlMdiExecute(inst, "G00 G53 Z0\nG00 X0 Y0 A0\nG00 Z0")--With Z moves
end

Any suggestions?

I'm not sure.  From what you are saying, A, B, and C are set up as 0, 1, and 2; this should work.
Maybe go into the config and disable all other motors just to be sure.

Under Axis mapping the only items checked are A(3) B(4) and C(5) which are set to Motor0 Motor1 and Motor2. All others have a red X.