I have a problem, which is related to your SDK, in my app and I was able to reproduce it in one of your example projects (WTSimpleARBrowser). I use XCode 4.5 and test your WTSimpleARBrowser on the an iPhone 4 with iOS5. To reproduce the bug tap the tab 'AR Browser' and after initialization has completed the tab 'First'. Press the home button and then bring the app back to the foreground.
The zombie output tells me: WTSimpleARBrowser *** -: message sent to deallocated instance
Could you please fix the issue or inform me about a workaround. As long as this causes the app to crash I cannot release it.