Cancelling image picker results in (almost) black screen

I'm trying the ANE on a Nexus 5 and when I press Back in the Image Picker, the app goes black. Well, almost all black, except for this tiny square of light pixels in the top-left corner of the screen. The app doesn't re-activate.

If I press Back again, the app activates and behaves normally again.

Am I doing something wrong or is this expected behaviour or is this a bug?

Cheers! :)