Could it be that there is an interference with the WP plugin theme my login http://wordpress.org/plugins/theme-my-login/
After activating Mage Reviews, I have some problems with http://www.mydomain.com/login - this page loads without the login form.
Did you also check this plugin with all browsers. It does only seem to work with Chrome. No luck with IE or Opera. Strange...
Hope to see a solution and some new versions as this is a very nice idea.
Keep up the good work.