Did you click the link in the bottom left that says "Having trouble logging in? and try those steps? Did you try the "forgot your username" or "forgot your password" links to see if you get a system email? Did you try a different browser or a different computer? Try all of those first and if you still can't login or you don't even get a system email then your account got corrupted and you need to create a new one with a new username, new password, and new email address. Also, delete your cookies and temporary internet files before you create a new account.
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