This one was really driving me crazy. Really. But we can't blame LDAP for that, at least I don't think so... We have a LDAP authentication set up which is working really well. Except when a user enters a wrong password - then he just gets a blank page. The same is the case for articles with a user restriction (user need to be logged in to view the article) - again, just a blank page. Turns out the blank page is not as blank as it seems - the source is there, including a nice error message. And a line somewhere in the head saying html{display:none;} A lot of research took me to this page , and I decided to try the following, out of some instinct: "Comment out line 823 (or thereabouts) in: libraries> joomla > html > html> behavior.php $document->addStyleDeclaration('html { display:none }'); To comment out, just add 2 slashes "//" in front of the line." Works like a charm. I am afraid the change will be undone by the next ...