pdflatex build error: Mismatched LaTeX support files detected

[Paul A. Rubin]

On 6/19/23 13:52, Rich Shepard wrote:
> The problem seems to be a biblatex/utf8 issue. The whole error log is
> attached and the error starts at line 500.
>
> Please teach me how to fix this and avoid future occurrences.
>
> TIA,
>
> Rich
>
I think the stuff about UTF-8 right above the error message has nothing 
to do with the error. The error just got discovered after that log line.

Taking the error message at face value, it looks like you somehow ended 
up with a very recent (June 2023) version of TeXLive with a not quite so 
recent (May '23) version of one of the files (expl3.sty). So maybe an 
installation or update of TeXLive got bollixed up? At any rate, it's 
unrelated to LyX. Somebody reported this 
<https://tex.stackexchange.com/questions/662487/expl3-sty-date-mismatch-after-tl-update> 
with an earlier version of TeXLive and posted what looks like a fix.

Paul
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