This was all down to Wikipedia bug with HTTPS being enforced.
https://bugzilla.wikimedia.org/show_bug.cgi?id=54626Wikilook doesn't work for https wiki pages. I'm looking into whether that can be patched, but for now if you have this problem:
goto wikipedia preferences, make sure "Always use a secure connection when logged in" is not selected.
you may also need to (for Firefox, don't know about others) goto tools/page info/security/view-cookies and delete cookies names forceHTTPS
Even then I had to struggle to get it to stick.
On Thursday, September 5, 2013 7:07:29 AM UTC+10, Michael@Oz wrote: