MM is a symbol used by PHI. You can either set $Global`$LoadPhi = False
in FCConfig.m (to disable loading PHI) or you can comment out lines of
MM /: MakeBoxes ...
> I just see that my message was obviously corrupted while I was sending it...
> Sorry for that.
> I was just saying that the symbol MM for the myon mass always gets
> replaced by an italic
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