Close Unity, then use this page:
http://docs.unity3d.com/Manual/Unity4xActivation-Overview.html
to find the location of the license file. Delete the license file. Then start Unity and it'll ask to be activated again. This should make sure that your Pro+AndroidPro serial is used. If you continue to have a problem, then it's possible that non-power of two render textures are not supported on Android.
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