The full version has sometimes been having trouble accessing the kanji and progress data from an external file. Hopefully this will be fixed very shortly ith an update. In the update I will also include in-app help info, lower the sounds, edit some data, and set the loading default to 'random'. Any other quick edits I should do?
If you are experiencing the kanji/progress loss situation, please leave feedback below, with the basic specs of your device.