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