I've only made two posts so far, but one post has a title and the other post does not (both posts do in fact have a title). I've tried deleting and re-posting. I checked the settings and display titles is enabled. I tried unchecking that setting and re-checking it. I think it's a bug. I did a quick Google search and it looks like in the past others have reported similar issues with the P2 theme and titles. If anyone from WordPress reads this, can this be looked into?