I'm using WordPress 3.3.2.
Everything was working fine, then I tried to upload a fairly large image via the Media Uploader and received a HTTP Error. I navigated away from the page, not realizing it would cause further problems, so I don't have the exact error - but from memory that was pretty much all it said.
Now when I go to edit a page or post (anything that runs from post.php I think) or the media section, it fails to load any actual content. Here's a screenshot. It also fails to load the admin bar at the top, the Screen Options and Help options don't work, the WYSIWYG is missing, and the flyout menus don't work.
I really have no idea how to debug this. Any help would be appreciated.