They seem to be paying well so I figured I'd add them to the AdWhirl rotation. Without any added complexity of AdWhirl I've been trying now all morning to simply reproduce in one of my viewControllers what the demo does. It's simple! really really simple but as soon as I load the viewController with the MobFox view my app crashes out with Code: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString md5]: unrecognized selector sent to instance 0x791d2c0' The magic seems to be happening at Code: 0x0007739d -[MobFoxBannerView asyncRequestAdWithPublisherId:] + 177 (I don't have access to the source there... ) Funny is, if I use the same publisherID in the sample app it's working. Well confused. Googling around a bit there seems to be virtually no information out there on MobFox. So, yes, they seem to be paying well but considering there is virtually 0 info out there, is it used? am I wasting my time here??