I had a few quirks at making TML work for me: mainly i couldn't access my new login page (wp-login.php still worked though).
So: make sure once you activated the plugin, to :
- check that a proper login page (not post) has correctly been created, and contains the shortcode in its content box (props to the plugin author for automating that)
- visit your Settings/permalinks configuration page. Although you don't need to modify anything, just hit the "save" button. This forces an update of the guid field values in the database and makes the new login page behave nice.
After that, my issues were solved.