I keep getting this due to formatting not supported in previous versions in
one cell, but I can't figure out what the difference is. I used format
painter from a different cell, but I still get it. Excel "Help" says
something about a fix button, but I can't find that. I even copied this one
cell to a separate spreadsheet, but I haven't been able to determine what is
causing the MLoF.

If someone can help me save what's left of my sanity, I'd be forever grateful.