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I get the same crash in 5.4.0b20
Answer: It's because of the move to Metal on iOS. Still looking at Android...
It seems that somewhere between Unity 4.6.2 and 4.6.5, GetNativeTextureID() changed behavior in iOS and Android. It used to return the texture...
The example code posted here works well: http://blog.csdn.net/nateyang/article/details/7881447