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IE says "This page does not have a rating."

There are two known flaws in the Content Advisor for Internet Explorer.

1. A 256-byte buffer length is used to read the PICS-Label HTTP header. If you enable several rating systems in the Content Rating plugin, Internet Explorer will not see a valid PICS-Label header in HTTP Only mode.
2. Certain items preceeding the PICS meta element in the HTML head will break Content Advisor. Check your page source code and ensure that the PICS-Label meta element is appearing as early as possible in the HTML head.