Here are some answers to questions you might have about using HoloLens, placing holograms, working with spaces, and more.
Any time you're having problems, make sure HoloLens is charged up. Try restarting it to see if that fixes things. And please use the Feedback app to send us info about the issue—you'll find it on the Start menu.
For tips about wearing your HoloLens, see HoloLens fit and comfort: FAQ.