500 Internal Server Error with 2.5.1

Hello,

i am trying to install the latest wordpress and getting 500, I´am on lighttpd with php 5.2.5 and fastcgi support.

I´ve installed a 2.5.1 for a couple of weeks on this server and everything worked fine but i deleted my test installation from before and now i am getting 500 Error on instal.php ? This is strange. The database is clean, the server should be clean too 🙂

The 2.3.x verion is working well, but i need to have the latest version cause of some plugins.

I tried the trick with php in the .htaccess but this doesn´t fixed it.

No clue what to do now. If I´am running

http://www.chixpoint.com/wordpress/wp-admin/setup-config.php

configuration of the wp-config.php worked ok but soon as i am getting forwarded to install.php it says 500…

lighttpd log:

92.227.201.220 http://www.mydomain.com – [11/Jul/2008:03:47:55 +0000] “GET /blog/wp-admin/install.php HTTP/1.1” 500 369 “-” “Mozilla/5.0 (Macintosh; U; Intel Mac OS X; de-de) AppleWebKit/523.15.1 (KHTML, like Gecko) Version/3.0.4 Safari/523.15”

Please help, thx