I am using IPN to be notified of new payments from PayPal on my site. I have changed the URL address of the listener page, but after several hours messages for new orders are still being sent to the old URL. I even totally disabled IPNs and re-enabled them, still old URL is used. Is there something I can do, will it eventually resolve?
If a notify_url is specified in the set up of each transaction, that URL will be used. This always takes precedence over any account-level IPN URL setting.
So, most likely you need to update/change your integration to pass the new desired notify_url when sending over each transaction (form post or SetExpressCheckout API call, typically)
Notifications for events on previous transactions, such as refunds or transactions for subscriptions created with the old notify_url , will still go to that old url. This can't be changed.