Apple is facing some early challenges in getting its iAd mobile advertising network up and running, according to a new report. Citing unnamed ad executives, the Wall Street Journal reports that some ad campaigns are experiencing delays due to Apple’s tight control over the creative process and the agencies’ learning curves. The report claims that the creation of iAds is taking from eight to ten weeks, or longer than normal for typical mobile ads, and the building of the actual ads, which is currently being handled by Apple, is sometimes taking two weeks longer than expected. Of the 17 iAd launch partners named by Apple, only ads from Unilever and Nissan were running for much of July; Citigroup, Disney, and J.C. Penney have since launched iAd campaigns with more companies to follow. Notably, one named launch partner—Chanel SA—is now saying it has no iAd campaigns planned at this time. A recent report claimed that early advertisers and developers are nonetheless pleased with iAd’s early performance; Apple recently added new functionality to iAd allowing developers to sell apps directly from within iAds, helping the company to fill iAd slots.