I'm in the process of setting up a local instance of Sugar in a vagrant box. I cloned the code from a repository, customized db parameters, host_name, and site_url in config.php. I also customized RewriteBase in .htaccess. I created an administrator user manually and set the password hash by following this article. Upon going to the URL on localhost, I see the login form. After entering the username and password I was taken to the User Profile form. But the Submit button of the form stays disabled even after the form is filled out. What could the problem be?