camera black out issue on screen? - iphone

I am working on virtual binocular in iphone.I made a application for both iphone and ipad. Getting issue regarding camera black out sceen. Actually, when first time application has load on the iphone its call viewdidload method after that it will call viewwillappear and then viewdidappear.But when I working on my application its work properly but during that duration if i open the other application and reopen again my application it gave me black screen on camera. it simply means that it didnot load the application

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Universal app splash screen errors

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I hv made an app for ios 4.2(IPhone 4)...it's working fine with just 1 problem.
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iPhone Launch Image zoom animation not working on physical device

I have developed an iPhone app with a launch image. When starting the app in the simulator, the image zooms in as expected. However, when the app is deployed to my physical device, the zoom animation is very short and sometimes completes instantaneously.
I'm sure it's nothing to do with my app start up as I put a sleep call in applicationDidFinishLoading to slow it down and this occurs after the zoom animation has completed.
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I tracked this down to the fact I have a large number of resources. Either the number of files (2400) or the combined size of them is causing a pause before the start up image is shown.