The Topic Information should be collapsed by default. You seldom use that information. RSS feed  could be moved to the right of Created on by .... Another Reply button should be on the top of the page. The current design needs a lot of scrolling down.  When you are in a discussion forum the Topic Map is essential that's where you click all the time. It's also impossible to see where you are in the thread, no arrow or marker for example a dot.  It's impossible to edit this rich text field on iPad, browser and platform should be detected and a warning should be sent to iPad users.  As noted by others it should be possible to get "Back" to where you came from, back to all documents is not what you want when your are deep in a thread.

 

Did click on "Anwered" by mistake!