Version 2.2.2 works fine on GNU Emacs 220.127.116.11 (i386-mingw-nt5.1.2600) when there is no challenge (e.g. arithmetic problem). But when external links are added, so there is a challenge, mediawiki doesn't alert the user or show the arithmetic problem. The only evidence of failure is that the page is never updated.
It wouldn't hurt anything if you filled paragraphs, would it? Mediawiki ignores single line breaks.