Currently on an updated TeX Live 2026, for the Additional.lyx manual (e.g., with default pdf2 format), I get:
! LaTeX Error: Command \columnseprulecolor undefined.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.4221 \renewcommand{\columnseprulecolor}
{\color{cyan}}
I can check whether I can reproduce also on an older system.
Scott
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