Hi Giuseppe,
> After some upgrades, I've a problem during htlatex compiling.
> It seems that dvipng also wants convert already existing png images...
> Also, during the conversion I get this warning: dvipng warning: at (20,732)
> unimplemented \special{em: graph icons/pcore/project_criterion.png,72bp,72bp}
> ]
> on all png images.>
this issue was fixed in TeX4ht sources some time ago, but it seems
that Miktex still doesn't have correct files updated.
I think it can be fixed using this answer:
https://tex.stackexchange.com/q/517859/2891.
Best regards,
Michal
