Hello Esteban,
I have applied the block of css codes below into your template's css file to fix the close icon in /templates/jm-joomclassifieds/css/custom.css
div#es-wrap .es-story .es-story-reset-button {
box-shadow: none !important;
color: #666666 !important;
}
As for the reason that you are getting the unauthorized access error message, it's actually because one of your menu is set to "Guest". It should actually be made "Public". I also can't reproduce the mod_recentdiscussion errors. Can you please advise?