Have a custom field for video code in the new_product admin. Everything used to work fine before switching to Godaddy's (ugh) C-Panel hosting. They say it's a mod_security setting that can't be disabled in a shared hosting environment. I can log into myphpadmin and add the iframe there directly, and it works. But when adding it in the admin area of the site and try to save, it throws up a 406 with the following:

An appropriate representation of the requested resource /admin/product.php could not be found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
The odd things is that adding iframe video code to the regular product description field works just fine. Also, if I just type something in the text box of the custom field it will save the page fine. So something is happening with how the custom field is adding the video to the database.