“malformed header from script” with 2.0.1

Hi …

i’ve searched everywhere, and it seems like some people have the same problem, but i have not found a solution yet.

installed 2.0.1 (php 4.2.2, apache 1.3.26, mysql 3.23.52) and

admin panel works fine apart from edit.php wich results in 500 internal server error
and viewing the site gives the same error too.

logs say:
malformed header from script. Bad header=HTTP/1.1 200 OK: /home/d/xxxxxxx.com/public_html/bug/wp-admin/edit.php

(well xxxxx.com is not the real servername)

there are other domains on the machine
a couple of wordpress installs too, all 1.5.2, all running fine.

i tried: (all of them clean installs)
– installing in different directories
– installing with different browsers (cookies cleared)
– uploading with different ftp clients
– deleting cache files
– turning off caching alltogether

none of those seemed to work 🙁

hope somebody comes up with an idea