Error messages

[Pavel Sanda]

On Wed, Feb 22, 2023 at 10:52:14AM +0100, Jean-Pierre Chrétien wrote:
> Dear developers
> 
> When I open the original UserGuide with 2.4.0dev, I see this in the calling
> command window:
> 
> Warning: dvipng failed to generate images from lyxpreviewOuMJqr.dvi...
> fallback to legacy method
> Warning: epstopdf failed on page 1, file lyxpreviewOuMJqr.001
> Warning: epstopdf failed on page 2, file lyxpreviewOuMJqr.002
> [...] snip
> Warning: epstopdf failed on page 109, file lyxpreviewOuMJqr.109
> Warning: epstopdf failed on page 110, file lyxpreviewOuMJqr.110
> Warning: Now trying to obtain failed previews through pdflatex
> Warning: Failed to produce 1 preview snippet(s)
> 
> When I open the French version, I get only the last line.
> 
> Any clue ?

Ghostscript chokes on our dvi.
If passed debug option to it via e.g. epstopdf --debug --gsopt=-dDEBUG lyxpreviewjGIxTU.ps
one gets:
Error: /typecheck in --div--

It seems related to hyperref, this page wrt preview+hyperref seems related
https://github.com/latex3/hyperref/issues/213
https://lists.gnu.org/archive/html/bug-auctex/2020-11/msg00000.html

I have no clue what 'latex shipout code' is and did not inspect further.

Pavel