19 February, 2011 Filed in: Japanese Kanji
Under certain circumstances the kana readings stop displaying. After 6 hours of searching, the bug has been found, lined up against a wall and dealt with sternly. An update has just been uploaded to Apple for review.
If you have a file that is experiencing this problem there is now a repair button in the study settings to restore the file to it's former glory - with your scores safe and sound.