I would recommend cleaning your browser cache and then trying again or trying a different browser (Chrome seems to work best if you aren't already using it) as a test. If it still fails, contact support and they can do a remote session and look around on the backend at some other items to see what might be happening.
I'm currently experiencing this issue. Were you able to resolved the problem?
I have not changed the password and it suddenly stopped working....
Disable LDAP resolved my issue. It seems like if you enabled LDAP it will disable the 'admin' login.
Go into CLI and run this command 'set ldap disable'
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The behavior is correct, if you enable ldap admins (wgui) and atdadmin (sftp) users are disabled and you are forced to use login via ldap, only cliadmin works on port 2222 ssh or directly from the cli prompt.