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Black Screen Issue

Hello!

I have black Screen Issue.

My developing environments are xCode 7.2, and El Capitan, Untiy 5.2.4f1, vuforia 5.

My app worked well before containing Google Play Service(GPS).

I don't know exactly GPS disturbing vuforia.

but I sure because I tested a lot of times about this.

Symptom is Turn on the camera in my app, UI and QRscanning working well but screen is black.

I think Rendering issue. other features working well only camera screen problem.

In xCode, there is no error or any problems..(it makes me sick!)

Anyone have same problem or solution?

Thank you for reading.