A new automatic screening technique Apple is using for the App Store appears to be backfiring, claims developer Rogue Sheep. The screening is believed to be aimed at catching unauthorized APIs, blocked under Apple's submission rules. A number of the apps trapped so far are allegedly ones using Three20, an Objective-C library. Rogue Sheep's Postage has in the past relied on some Three20 code, and so private API calls were removed from the software before submitting a recent update.