Why can't I pin new Live Tiles in the newest Windows 10 Preview?

[Windows Central Question]

When I try to pin a live tile, nothing visible happens. It acts as if the tile is there, because if I right-click the app again, the drop-down menu says "Unpin" instead of "Pin". But the tile itself is nowhere to be found. It only shows up after I restart the computer. Does anyone else have this problem?