I've tested:
* to upgrade from 624 to 691 with a working library and some tracks. Works
* Sync tracks. Works
* Clean up everything and sync 1000 songs to mma. Works. During reading the new tracks and artworks mma stopped scanning. After a retrigger to scan all songs where found.
* Playing song from library or from folder. Works
Great job! Done well! Really appreciate your hard work
