Hello :-)
I'm sysop of
http://fr.opensuse.org/Bienvenue_sur_openSUSE.org
but not server admin (no access to the mediawiki files), so with little debugging capability.
the page given here _don't show_ the same sidebar as connected and not connected.
when not connected, I have under "opensuse", as second line, "Vue d'ensemble"
however I changed this in mediawiki:sidebar (because the "'" bug) to "Le projet" and I have the latter if I connect!!
this is not a problem in se, but thare are also other bugs, at least a layout bug (when not connected, the sidebar is pushed out of sight).
you must now that this is a mediawiki farm (a wiki per language) and that Novell admins are on the way of redefining the layout slightly - we work together and I try to help, may be this problem have nothing to do with mediawiki per se (the problem is only seen on the french one, but I don't see any bug on my part).
I have disabled the cache on mozilla and konqueror (they show the same problem), and used action)purge without change
thanks jdd