[Plugin: Theme My Login] Registration not working

I love the Theme My Login plugin. It certainly helps the continuity of my blog. I am having one problem though. When I select the registration option from the sidebar widget and then enter all the registration data on the page (not within the widget), I press the Register button and the registration page simply re-displays with no error messages of any kind. Thus, no one can register. If you would like to try it out, go to http://thequantumbrain.info/login/?action=register

http://wordpress.org/extend/plugins/theme-my-login/