Ok, this one i cant figure out. Every time I try to log into World of Minecraft, if i click Resume then it works and send me to the last server I was on. If i click Sign In, then an error pops up.

Unable to Authenticate

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

Now, I've triple checked my Name and password, and they are correct. Logged onto Minecraft website without a problem, and even installed a new World of Minecraft client. Nothing works. Any suggestions?