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If you log into the new bugzilla 5.0, with a wrong password, you will be directed to a page telling you to 'Press back and try again' In the top right of the page you will have a login button. When you click on this it appears to be broken. It shows you a 'Create account' button, but nowhere to enter a username and password. In the old interface this screen wouldn't present you with an option to login, which is probably the source of the breakage.
Tested on QA environment(5.0.3-rh8) Result: Pass