Hi Scott,
Strangely it seems the standard Lathe 1024.lset screens don't have anything assigned to the HomeX, HomeY, or HomeAll buttons. Switching to the standard 1024.set screens for a mill and Pushing the Ref All button works for me. The Ref All button has the Basic Script:
DoButton( 24 )
DoButton( 23 )
DoButton( 22 )
DoButton( 25 )
DoOEMButton(133)
DoOEMButton(134)
DoOEMButton(135)
I downloaded a Mach3 Screen editor from here and used it to add that Basic Script to the Home All Button in 1024.lset. I saved that as 1024TK.lset (see attached).
Please load this screen set (Mach3 | View | Load Screens) to see if the Home All button then does something.