I assume this is because I don't own any Settlers, but it should still give me the right to look.
This is maybe a dumb question, but did you have anything in the discard pile? If you play Bustling at the top of a shuffle, it won't have anything to look at.
You can look at the cards, they instantly disappear again though.
For now, you can look at the cards you "looked at" in the log, at some point in the future the cards will probably be actually visible in the reveal area.