Preparing and Using winCube offline is not intuitive and comes with a lot of manual preparation work. The following suggestions would improve the usability a lot:
Prepare offline usage when favorites are updated, not as a separate action: Currently if a user wants to use doxis offline, he needs to do two actions: prepare offline usage and update the offline-favorites. Preparing the offline usage should be done automatically when the offline-favorites are updated.
automatic updating of the offline favorites should be more frequent: Currently this is only done once per day automatically. This means all users need to remember doing this before logging off, since they can never be sure if their recent changes have been synced or not.
Offline Favorites should be checked for up-to-dateness when closing the client: see previous point... users can never be sure if it has been done or not. If they get a warning when closing the client, they can be safe.