There’s a bug with the post editor that causes the full screen editor to get stuck making it impossible to go back to the main edit post view. It’s pretty rare to get this to happen as the content box needs to be partially off-screen when you tap it. But since it’s quite annoying I think another update with this fix in it would be a good idea. It was just a small change to the focus listener on the content box to fix it.
New build: http://bit.ly/xhVk77
Hopefully after this we can focus on version 2.1 :)