I did a manual update to ver 1.8.4 a few days ago and I just noticed that the display format dropdown (Posterboard, Month, Week, Day, Agenda) does not work. I don't know if there is any relationship between the update and the display format not working, but it sure is suspect. The timely demo works fine, so I have to think it could well be the upgrade.
Replicated the problem on two computers (Win 7 Pro) and an Apple iPad (iOS 6.0.1).
Has anyone else noticed this?