My account got hacked through the use of optifine. That's the last thing I did. And the next thing you know my account isn't being accepted into either minecraft or mojang.com. Good thing I use seperate passwords for everything, including my actual email and my mojang email. Otherwise it looks like that would have been gone too. It's stupid how optifine makes you enter your actual minecraft credentials and doesn't attempt to be more secure. But how can you complain? Have you seen the optifine website? It's like a 90s website.