Thanks for the quick answer. This error looks tricky indeed. I haven't the faintest illusion I could have found out by myself...
Hans van der Meer On 17 Feb 2016, at 13:34, Hans Hagen <pra...@wxs.nl<mailto:pra...@wxs.nl>> wrote: That was a tricky one to nail down ... it related to the fact that have \{ and \} have a different meaning when we flush metapost text (makes me wonder if that is still needed) this helps \installmathfencepair \letteropenbrace \Lbrace \letterclosebrace \Rbrace
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