If the HMD loses tracking (for instance if the lights in your room go out), the system screen with 'tracking lost' appears, and when tracking returns, the game is restored to an orange screen with no way to interact with anything or to open any menus (the audio appears to continue playing as normal)
#Orange screen when regaining tracking
steep falcon
winged heath
The next update has a change to snap the player back into the world space if they have moved outside for whatever reason (tracking change, self induced, etc) which should fix this issue.
Thanks for the report.