Try something else:
/mac hidden <yourbarname>
When I say yourbarname, I don't mean 'MacaroonBarsHandler5' or whatever, I mean the name that you gave the bar when you created it; the one that shows in the Macaroon window.
Also, make sure that Show Grid is on and hidden is off.
Thirdly, if you are using stance, is the bar only set up to be active in one stance?
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