Not necessarily troubleshooting, but...Timed Practice
I predate Timed Practice's introduction to the store (it was just allowed), so I get free timed practices for life. My question is, when you are in the lingot store, do you just pay once for the right to use unlimited timed practices in the future, or do you have to buy each individual session?
Timed Practice stays with you wherever you go (or at least that is the last information I had and mine so far has followed me wherever I go. (Spanish for English speakers, English for Spanish speakers, and English for Japanese speakers.)
Different items have different rules. This guide here explains more about the items in the Lingot store :)