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Revive Adserver only updates its view of statistics in the user interface once per hour. (There are no settings you can change in Revive Adserver to change this.) Unless
In addition, unless you have also set the maintenance script to be run manually, Revive Adserver will, by default, only perform this update update your statistics in the user interface when a banner is viewed on your website some 5 minutes after the end of each hour.
Finally, the statistics screens in the user interface are cached, and may not update immediately, even if the statistics have been updated by the maintenance script.
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