I belive I know what you are saying. Belive it or not even if you unlocked the dungeon it will not show up under the roulette until those dungeons on the rouletts list are complted at least once. When you click on the selected roulette if the dungeon need to be coplted you will see the text coe up in red and will say the following requirements are not meet. It will show you the list of dungeons you need to run in red texed to unlock the roulette.