In Zen Cart <= 1.5.2, requests for an EZ-Page which does not exist simply display a blank page. Can you verify the page you are trying to change the URL for is actually an EZ-Page (part in red indicates EZ-Page)?
"/index.php?main_page=page&id=11"
If you wanted to redirect the Zen Cart "specials" page (part in red indicates specials page), section 10 (method 1) of the CEON URI readme covers this subject.
"/index.php?main_page=specials"
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