Reported on #huggle freenode channel.
[20:15:03] <Oshwah> Hmm anyone getting WrongToken auth errors from api.php when trying to login/use Huggle?
[20:15:09] <Oshwah> I'm getting it every time now.
[21:24:52] <galar71> Hi...I've got a login issue with Huggle 3.1.18... Worked earlier today, and I've never seen it before
[21:25:51] <galar71> Is anyone possibly available to provide some ideas/feedback?
Timing coincides with MW 1.27.0-wmf.13 being deployed to Wikipedias.