To troubleshoot the GearVR viewer sometimes it's helpful to uninstall and try a fresh install. 

To uninstall begin by navigating to your Android devices settings menu. 

Find the "Apps" or "Applications" menu.

Next, find and click the InsiteVR GearVR application. 

There are two: the GearVR viewer is the dark blue icon.

Then click "Uninstall".

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