Black screen after resuming app

Black screen after resuming app
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On ios 5.1 cocos2d-x game after move into background cause a black screen at first time you resuming. In second time it’s all ok. This only happens on ios 5.1.
Before that we had crash like this - But fix it.

On black screen status bar is also appearing.

We try both latest version of cocos2d-x. The same behaviour.

P.S. Also try to reproduce this bug on cocos2d-x 2.0 tests - the same thing ( black screen appear).

P.P.S. Sorry for my bad english)