The threads look the same when you open them , but the 'Top" page lloks different (the forums are listed side by side,in two columns, rather than in one big list). Also, instead of a "chart" or table-looking thing that lists the information about each thread, all the info is separated by commas, plus you don't know who that last person to reply to your thread is because that column is gone.
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Oh, wait...edited to add, I just figured out what's wrong and I fixed it. I was looking at "classic view" but changed it back to "dcf" view and everything looks the way I usually see it.