Further investigation suggests that this is a known issue of using
\definecolor colours within a Tikz graphic that decided to manifest
itself for the first time when I upgraded.
The solution is to do:
\unprotect
\pgfutil@definecolor{colour_name}{rbg/cmyk/gray}{...colour values...}
\protect
for all the colours that you want to use.
Apologies for the noise.
Felix
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