So I just tested. My guess was wrong...

But this:

""""""""""""Do you see the "Project to cplane" text after the check boxes in the other MoI dimension/annotation commands?""""""""""""""""

No. I cant find anything related to cplane projection in any of the dimension commands...

Mine just automatically projects to the current cplane... But I have no checkboxes for it...

Can someone else show me a screenshot of these checkboxes in the normal dimension commands?

Maybe Michael can clarify.