Anyone else who can't put anything in their learning/mastered list ?

I've tried to add the Katakana to my learning list, since I still have trouble with them. But it won't work. I can't add them.

Try to add them from the katakana lessons page, for example http://www.tanoshiijapanese.com/lessons/lesson_details.cfm?lesson_id=11

It works for me.