@Davidfor: Had an interesting experience last night. Attached the Glo, let the automatic processing happen (DB backup, Reading List process to send some books, some metadata changes), deleted two bools, and unplugged. it
I only added 2 books yet when the Glo stared processing it took forever, and the Glo reported 100+ new books, and all reading locations were wiped out
Reattached the Kobo and saw numerous database errors.
Renamed the database on the device and copied over the backup, then after ejecting did a power cycle on the Glo.
All was fine.
Any interest in any of the databases and logs? (I should add calibre is running in debug mode, and I have not restarted it yet, so still have the full debug log).