You should hide reading list buttons in speed dial items.
Here's a article about it: http://my.opera.com/daniel/blog/2012/02/05/hiding-extension-ui-in-speed-dials
I installed it into build 1380. I submitted my login informations. Then it gave me nothing. After browser restart, it's just showing empty popup page but number of unread items badge is true. Between readitlater moved to http://getpocket.com/