At http://en.wikipedia.beta.wmflabs.org/wiki/Talk:Flow_QA the only page content is <flow-action-unsupported>
Ditto for http://en.wikipedia.beta.wmflabs.org/w/index.php?title=Talk:Flow_QA&action=history
No errors in webconsole. Same results logged-in/out, and in Firefox/Chromium.
But http://en.wikipedia.beta.wmflabs.org/wiki/Talk:Flow works normally.