The file doesn’t contain the macro under the buttons, you would need to edit the button and copy out the macro and post it here. You can also test your macros in the MacroEditor. I will drag out my Macbook and test later - need to run now.
ok
I have now deleted the button and made a new one, with _View direction in the Macro.
Now it works - kinda
every second click changes the view direction. It now alternates between CPlane and View axes.
really weird !
Here are the macros for left and right click
Meters
NoEcho ! _-Options
_ModelingAids _Nudge
_AltPlusArrows=_No
_Direction=_View
_Step=0.1
_ControlStep=0.01
_ShiftStep=1.0
_EnterEnd
Millimeters
NoEcho ! _-Options
_ModelingAids _Nudge
_AltPlusArrows=_No
_Direction=_View
_Step=100
_ControlStep=10
_ShiftStep=1000
_EnterEnd
So if I understood correctly, it’s not the macro itself that’s crashing MacRhino, it’s the button editing.
I have no idea why it would alternate between _View and _CPlane on successive button presses - there is nothing in either macro to set it back to CPlane once it has been set to View.
@ohlers are you submitting the crash reports? I could not reproduce a crash here.
Yes I have submitted every time it crashed ! 
yes correct.
I dont know either. That part might be another bug, separate from the editing issue.