[wp-hackers] getting 500 Internal Server Error

[bujanga]

I upgraded my test site to 3.0 and am now regularly getting the HTTP
response '500 Internal Server Error'. This is typically due to a
mis-configured server but I have not made any changes to its
configuration. I am also unable to cause this response except
randomly. Is anyone else seeing this?

My log files do not show any errors related to this. Version information is:
Apache/2.2.14 (FreeBSD) mod_ssl/2.2.14 OpenSSL/0.9.8e DAV/2 PHP/5.3.2
with Suhosin-Patch mod_perl/2.0.4 Perl/v5.10.0
____________________________________

CONFIG FILE

# NPEXCHANGE.ORG

<Directory /path/to/site042/web>
    Order allow,deny
    Allow from all
    AllowOverride FileInfo Options
</Directory>

<VirtualHost 65.23.153.86>
    ServerName npexchange.org
    ServerAlias *.npexchange.org
    ServerAdmin npexchange at gruffgoat.com
    DocumentRoot /home/sites/site042/web
</VirtualHost>

# end NPEXCHANGE.ORG
____________________________________

.HTACCESS FILE

RewriteEngine On
RewriteBase /

#uploaded files
RewriteRule ^(.*/)?files/$ index.php [L]
RewriteCond %{REQUEST_URI} !.*wp-content/plugins.*
#RewriteRule ^(.*/)?files/(.*) wp-content/blogs.php?file=$2 [L]
RewriteRule ^(.*/)?files/(.*) wp-includes/ms-files.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteCond %{REQUEST_URI} ^.*/wp-admin$
RewriteRule ^(.+)$ $1/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule . - [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(wp-.*) $2 [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

<IfModule mod_security.c>
<Files async-upload.php>
SecFilterEngine Off
SecFilterScanPOST Off
</Files>
</IfModule>

____________________________________

Gary Dalton