When I try to log in to the login page (https://ip_of_server:8443), I see the error message "Please enter a non-empty password", and then the login button is greyed out. I've verified that the credentials are correct. There is only one way for me to login, and that's by clicking on Change Password.
When I change the password, I can log in. But I have to repeat this process every time I want to log in.
It's the virtual appliance running on an ESXi server.
Not sure if this is relevant, but during the OVF deployment of the appliance on vCenter I did not see a Properties screen, so I had to edit the ovf.xml file manually.