mod_security is known to break some parts of vBulletin while not breaking other similar parts. You get errors with the default installation of mod_security because of this:
Quote:
The default mod_security settings from the mod_security site DO break some bits because it forbids the some enctypes of POSTed requests.
However, the version I have laid out in my first post does NOT break things, as I removed what I felt to be paranoid settings and instead configured mod_security to solely look for known attacks.
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At any rate, you need to find out exactly how this server is set-up before I can help you any further.