After checking the data of those players who reported that they were not receiving daily quests, we have pin-pointed the issue. For those of you who are not getting the daily quest anymore, this is occurring because the Daily Quest is appearing at the bottom of your list of quests. If your left hand side of the screen is filled with unfinished quests, then the daily will appear below those quests, making it off-screen and unreachable. We are currently working on coming up with a way to resolve this issue. But for the mean time, the easiest fix would be to finish some of the current quests that you have to make some room in your quest list.
Sorry for the inconvenience. But keep an eye out for any news on this in future updates.