GearVR Back Button recognized as a click

Hi,

I am current using Unity 5.5.3f1 to develop GearVR application through Oculus Utilities 1.13. For some reason after I updated Unity from 5.5.0f3 to 5.5.3f1, the GearVR back button is being recognized as a click event rather than a back button press. So, for example, if I am gazing at a clickable target, if I press and release the back button, it performs a click of that target and then shows the oculus exit to home screen. When I used Unity 5.5.0f3, it did not do that. Any ideas?

Thank you!