hi.
*) first thing to say: admin options: display » design/presentation » login style » login style general options > style sheet url ... the plugin is calling for 'wpurl' and the text-field is asking you for the REST of url. for ex. /wp-content/yourtheme/login-style.css
please make a note on this. i thought nothing was working, until i checked the plugin code and asked the codex "'wpurl' - the WordPress address (URI) is the URL for your WordPress installation and is set in Administration > Settings > General. This data is retrieved from the siteurl record in the wp_options table. "
*) plugin working fine in 2.7
*) working together with "cimy user extra fields" and "login lock-down" without a problem at the moment