My own Joomla-installation on
www.gf2009.info doesn't appear to have any problems (but I haven't used/tested it over the last few days so I don't really know if there was ever a problem in the first place). All pages does look allright, and I can use the admin interface without being redirected/kicked out.
I'm on a
VPS Hosting in case that matters, and I don't have any of the SecFilter-rules in my .htaccess file.