I've got the same problem on the iPhone app. It is annoying to say the least. To expand for the benefit of others if it's an isolated bug:
When accessing the "Latest" menu, instead of getting the "Unread", "Participated" or "All" posts in chronological order we get a list of forum names in alphabetical order. It then is a pain to search for the thread you want to find. We've effectively got two forum search functions instead of a latest post search function.
Haven't tried deleting the app then reinstalling it as I'm bone idle.