screenshot of "there is no page" for page that should exist
I was browsing today on MediaWiki.org and got a "There is currently no text in this page. You can search for this page title in other pages, search the related logs, or edit this page. " For a page that definitely existed/had content (you could see it in the history view).
I purged it, and the page's content re-appeared. I then hit special:random a bunch of times to see if this was a one-time issue or if more then one page was affected. Within about 10 special:random hits, I got another "missing" page (screenshot attached) which would seem to indicate that the problem is affecting quite a few pages...
I see ES mentioned a lot in the sidebar bug (bug 31100) so possibly related(?)