In last two weeks attempt to rollback some edit often fails with message "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." Reloading and trying again doesn't help. It's just happened on this page https://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%B5%D0%B4%D0%BC%D0%B5%D0%BD%D1%81%D1%82%D1%80%D1%83%D0%B0%D0%BB%D1%8C%D0%BD%D1%8B%D0%B9_%D1%81%D0%B8%D0%BD%D0%B4%D1%80%D0%BE%D0%BC?action=history (attempt to rollback last anonymous edit). Complaints about this problem received from other ruwiki users.
Specs:
OS: Win 8.1
Browser Chrome, Firefox