2009/10/8 Aude aude.wiki@gmail.com:
That will happen when the "Use external editor by default" option is checked in editing preferences. In order to get external editors to work, the browser needs to be configured.
http://www.mediawiki.org/wiki/Manual:External_editors
If that's not the problem, then I'm not sure what the problem is.
Alternatively, it could be that a blank page somehow got stuck in Squid. If that's the problem, it should go away when the page is edited or purged.
Roan Kattouw (Catrope)