Try now!

The advanced editor has been upgraded to a new version (what a massive pain trying to do a major version shift). You might have to CTRL-F5 or even delete your temporary internet files to get it working (some browsers hang onto javascript files way too long).

Note that the advanced editor's spell check button is now disabled, as the updated editor crashed with the old plugin for our server-side checker, no updated plugin is available, and I didn't like the standard spell checker that's slow and full of ads.

However, to make up for it I've configured the new editor so that a modern browser's built-in spell check will work just like it does with the normal/plain text entry box.