If you max out DC capacity and click 'inbox' before claiming the rewards and closing that tab first you get stuck with the rewards screen no matter where you go in the game until you restart the game.
(Screencap from PC client)
If you max out DC capacity and click 'inbox' before claiming the rewards and closing that tab first you get stuck with the rewards screen no matter where you go in the game until you restart the game.
(Screencap from PC client)