My HUD randomly disappeared after joining the crucible. Died horridly in two matches. Had to completely exit the game to bring it back in any mode. Logging out and back in had no effect. Also the HUD was absent in all game types after it disappeared, just to be clear on that. Loving the beta though.
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If on console you have to go back to the main menu/dashboard and come back into the game. It happened to me when starting another character and that's who I fixed it.