Astonishing: The migration happens for sure: I end up with a "foo.new" file adjacent to my original file. If I delete the original and open the .new file, it is the migrated version complete will all data, including the new attribute (with its default value) that I added in the new data model version!

So the migration happened... I have a .new file which is the upgraded file... but what would stop the upgrade process copying the .new file over the original data file?

The original file is not locked or readonly. Isn't it supposed to backup the old file to foo.~ ? That hasn't happened. Why not? No useful errors in the console. Any ideas on what to check?

Cheers,
Graham.
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