Right now, I cannot log in to Wikipedia. Whenever I try to, it always says "There seems to be a problem with your login session; this action has been canceled as a precaution against session hijacking. Please resubmit the form. You may receive this message if you are blocking cookies.", regardless of browser or device.

For that matter, I also noticed that lots of the recent edits appear to be IP edits, possibly due to the inability to log in.