[reSIProcate] wiki login errors

[Daniel Pocock]

I'm getting this error when I try to log in to the wiki:

"Login error
There seems to be a problem with your login session; this action has
been canceled as a precaution against session hijacking. Go back to the
previous page, reload that page and then try again. "

I'm using https and I've tried clearing all resiprocate.org cookies -
can anybody suggest anything?