I actually have a very similar issue, if anyone knows how to fix this that
would be fantastic...

Here is my terminal output :
webhttrack
/usr/bin/webhttrack(11614): launching /usr/bin/x-www-browser
/usr/bin/webhttrack(11614): spawning regular browser..
Nouvelle fenêtre ouverte dans la session du navigateur
/usr/bin/webhttrack(11614): browser exited
/usr/bin/webhttrack : ligne 154 : 11632 Processus arrêté     
${BINPATH}/htsserver "${DISTPATH}/" path "${HOME}/websites" lang "${LANGN}"
$@

Thanks !