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I’m doing a document with a master and some included files; Style is 
“generic” with some fat margins. Setup is TeXmacs 1.99.13 on Mac OS 10.15.5.

Everything is fine for awhile, and then more-or-less randomly the included 
files start showing all section headings with a prepended “<error | bad 
plus/minus>” . The version as rendered in the master is fine, as is a pdf 
export, so this is mostly an editing annoyance/distraction. Still, I use 
TeXmacs because the clean look helps me concentrate on writing, so a 
distraction is unfortunate.

Any solutions?

        m