Password problems
If you can't log in and you get an error about invalid username or password, you absolutely are not entering in the correct username and/or password. The system does not make that type of error looking up your username and password and calculating the correct value just as a calculator does not error on a simple 2+2 equation.
Note that passwords are CaSe sensitive while usernames aren't. The only other possibility is someone may have access to your account and is changing it.





