Kevin Pacey wrote on Tue, Feb 2, 2016 11:38 PM UTC:
Fwiw, one thing that's happened is when I've misspelled the name for the
image of a piece within the parentheses (aka braces), nothing will appear
in the diagram for where the piece image should have been. This can also
happen if one forgets one of the pair of the parentheses, or, say, uses one
too many of them.