This has been happening for more than 24 hours, so it's not the fluke that I thought it might be. When I click "create a new topic" this is often what I see (multiple images merged together so you can see the full page of what I'm seeing...or...as the case is...NOT SEEING).
As you can see, everything is there...EXCEPT THE TEXT BOX. It takes multiple page refreshes, or exiting out and trying again, before I finally get a workable page. Tonight I'm also seeing something similar when I reply to a thread, so it's evidently not just when creating a new post.