The sort order is shared by all forums. It can happen that:

• A user opens/downloads forum A with sort order X.
• The user opens forum B and changes sort order to Y,
• The user goes offline and opens forum A again. The app displays a message that the sort order cannot be loaded.

It would be nice if we remembered which sort orders are cached by each forum (or at least the last one) so we can display that one in this case. We could even add some visual indicator in the sort order selector so the user knows which orders are cached (or the last one that was cached).