UPDATE: I have uninstalled the Classes App for now, and will try again later. My other issues still remains.Just for an example, I go to the site, click on "Discussions" in the menu, I am sent to the Discussions-home url,  there are two blocks, on "Latest" one says "Discussions with Latest Posts" and the other "Discussion Categories", both say "EMPTY". All of my blocks on all of my other items say the same thing. Except "People" which works as it should.