Since the launch of AdDuplex we haven’t enforced having an exchange ad setup before your app becomes active on the network. This resulted in some apps not setting these ads up and accumulating impression credits among other side-effects.
This situation isn’t good for the overall balance of the network, so we decided to enforce having an exchange ad setup before your app becomes active on the network and can start getting impression credits.
Starting on Monday, August 8th, 2011, apps without exchange ads won’t be considered active on the network and won’t receive impression credits for ad impressions they serve. Please, verify that your app(s) have exchange ads setup.