[Mediawiki-l] Problem with Searchfunction

[Robert Pfau]

Hi
Iam having problems with the search function.
It looks like any words i type into the search box is just ignored.
When i enter for example 'Special:Version' it shows me a search-result
without results (not even "0 results found" or something like that)
just blank... :-/
In the url it works fine http://www.dystopie.de/wiki/Spezial:Version
Same with any other article or special site.
You can try search for Searchtest - nothing
and here it is... http://www.dystopie.de/wiki/Searchtest

    *  MediaWiki: 1.5.3
    * PHP: 4.3.10 (apache2handler) (SafeMode is Off)
    * MySQL: 4.1.10a

I have no excessive customisation, its nearly the default settings after
the install.
DebugLogging gives me the following when searching

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Start request
GET /wiki/Spezial:Search?search=Searchtest&go=Los
Host: www.dystopie.de
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.8)
Gecko/20051111 Firefox/1.5
Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer: http://www.dystopie.de/wiki/Hauptseite
Cookie: wiki_dbUserName=WikiAdmin;
wiki_db_mw_session=864e9b5ce8b526639f443d112c8d111c;
wiki_dbLoggedOut=20051221211351; wiki_dbUserID=1

Main cache: fakememcachedclient
Message cache: mediawikibagostuff
Parser cache: mediawikibagostuff
User::loadFromSession() unable to load from memcached
Using reader #0: localhost...
User::loadFromSession() successfully saved user

** private caching;  **
Request ended normally
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
The table Searchindex exists btw.

Thx in advance for any help :)
-robert

(The Wiki is in german, but i think nearly everything is
synonymic.Shouldn't be a problem)