Error sending PM all the sudden? Urgent -

[pythonimp]

Hey guys, so I've never had a problem with the PM system on my forum, and all of the sudden I try sending PM's to users and it redirects to a new page saying "403 error" when I reply.

I've not changed anything in the templates or code or anything. It's random?

Here is the URL I'm getting the error on:
http://www.codspot.com/private.php?d...tpm&pmid=19184

Here is the error message:

HTTP 403 - Forbidden
This area is forbidden.
Suggestions

    * Try Again
    * Go to http://www.codspot.com/
    * Try finding an archived copy in the Wayback Machine.

Why am I seeing this page?

The Alexa Toolbar offers suggestions when the page you are looking for cannot be found.

I need to fix this soon, tons of PM's are passed daily and is a big backbone to user communication here.

Thanks guys!