Subview shifting down 20 pixels when called in AppDelegate

Question

I'm facing this issue when I'm calling AdMob ad with

[rootController.view addSubview:adMobAd]; //setup the ad

Upon returning from the ad being clicked the AdMob frame moves down 20 pixels. However it seems that this is not a AdMob issue, but a issue that is also discussed here: http://discussions.info.apple.com/thread.jspa?threadID=2288486

However I couldn't get it to work, any ideas?