Added the "Old HSK" list - all works fine. Than I've realized that there is the (new) "HSK" list and added it as well. When I cram on both and press "Add" (to add character manually) - it seems to be always added from the "Old HSK". When I cram on the (new) "HSK" alone - then I've got to 15 characters (know them all by the way from the old list) but can't add more - the "+" button is simply inactive. What am I doing wrong, please?