Last modified: 2014-07-30 06:40:56 UTC
If a page is loaded with AJAX, the dismissablesitenotice js calls document.writeln(), which promptly replaces the entire page with the site notice. This is not really desirable :) I'll sort this out, since it's for my live preview.
This was fixed in I069f7f70c2d2a8a0f403452d6ccef82f659418af I believe.