This is driving me completely crazy.
I've been using URL rewriting on this freshly installed server for custom URLs, but it seems that whatever URL rewriting rule I write in htaccess will be taken into account forever..
RewriteRule ^dashboard/calendar/$ /calendar.php [QSA,L]
Though it was a long time ago, I believe rebooting the whole server fixes it. Otherwise, creating a new VHost and a new directory for the files will do the trick..