Hi, my name is Daniel (dlowden) and I've had an for quite some time when trying to login. When I press 'Sign in' it will come up with the message: 

Unable to authenticate

Your username/password may be incorrect or there are no servers available to validate your login.

I have tried this on 4 different accounts numerous times and made sure that it was the right password for each on minecraft.net. I can't change servers or login with my alternate accounts at all, and the only way I can use World of Minecraft is with the 'Resume'  button. I have tried completely deleting and reinstalling World of Minecraft but it did not work.

If I need to include more information please tell me.

Thanks.