от bleak_one
Ответ поддержи девиантарта про довольно раскрученный прокси antizapret.prostovpn.org
Распространение приветствуется
You should stop using that proxy immediately. Everybody needs to stop using it. It's completely unsafe for any and all activities that require account logins.
What that proxy basically does is that it caches the page of the first user who accessed any URL and serves it to everyone who visits that URL again, which is why you found yourself logged into someone else's account and also why someone else was logged into your account.
It caches entire user sessions, which it absolutely should not.
Please spread the word about this to anybody you know who also uses this proxy to access deviantART. It's a severe security risk.