Hi, love the site.
I seem to be experiencing a sudden problem as of today, saving lists in Vocabulary.
I use lists to groups kanji and compounds by radical, so up until today I had about a hundred or more lists, as everytime I found a new radical in a kanji, I made a list for it.
Now the site is telling me I no longer have any lists, so I cannot save any more kanji to them, which severely restricts the site's usefulness to me. This isn't a feature found in many other Japanese language learning sites, so I'm hoping it's just a database setting or a bit of code to kludge up...
I have an email sent to contact@tangorin with screenshots, if that helps. :)