Q: Some cards just show "@...@". how can I fix this?
A: Sometimes updates will change cards so much that older drills
containing those cards will no longer work with them. To fix this:
edit the drill (long click on the drill)
(optionally) re-add the missing cards
save the drill.
Q: How do I migrate my drills to the Pro Version or a new phone?
A: The drills are stored in a user accessible directory on the phone.
The exact location of the directory is listed on the About screen
(Menu:About) under Storage. Copying the files will transfer the drills.