Internal Server error on Apache with Agentpress

[imported_clementsm]

Hi, I uploaded & activated AgentPress 1.01 to my server (Apache 2.2, PHP 5.2.11 with Suhosin-Patch 0.9.7) and I get a 500 internal server error.

If I turn up debugging on the virtual host I see the following

174.X.X.X - - [02/Nov/2009:18:24:21 -0800] "GET / HTTP/1.1" 500 20 "-" "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.1.4) Gecko/20091016 Firefox/3.5.4 GTB5 FirePHP/0.3"
Mon Nov 02 18:24:22 2009] [debug] mod_deflate.c(602): [client 174.X.X.X] Zlib: Compressed 0 to 2 : URL /index.php
[Mon Nov 02 18:24:22 2009] [debug] mod_headers.c(743): headers: ap_headers_output_filter()

The only way to restore the wordpress instance is to manually edit the database to activate another them.

As the logging is so spectacularly sparse, I actually don't know where to begin to look. My ideas are, somthing that needs to be changed in php.ini?

Anyone else seen this before?