I just ran into a problem. I was on the deckbuilder putting in a new edh and it wouldn't let me add certain cards, none of which are banned. {Priest of Titania}, {Skyshroud Poacher}, and {Desert Twister}. I normally build decks with the filter on but with this I just turned it off.
Yes, legalities data in the next version should be a bit better.
It's not a big problem. It just took me minute to realize that I needed to take the filter off to add the cards. Lol