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There appears to be a problem with a menu command Convert To / StandardForm (Crtl+Shift+N) with respect to InterpretationBox which contains TagBox (which is how Column/Grid and friends are typeset). Here’s an example: obj /: MakeBoxes[obj[arg__], fmt_] := With[ {appearance = MakeBoxes[Panel[Column[{arg}], “obj”], fmt]} , InterpretationBox[appearance, obj[arg]] ] obj[1, 2, 3, 4] % // InputFormRead more