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When the user browses to a specific page we try to show him the notes that he has on that page. We do that by comparing the current URL with anything in the CNotes table that matches that URL & user id. That works in 99% of the cases, but if your URL scheme changes for some reason (like you go from non-SEF URL to SEF URL, or you start to use a new SEF extension) the module won't be able to properly match the notes for the page. However -> the user will be still able to see the notes in the "User notes" view of the component.