The fix for me was to delete the metadata.calibre file from the device. This was rebuilt at the next connection and everything was OK.
But, I kept a copy to see what the difference was. Looking at it, I saw that I had added a new column today. As it was an experimental column to see one of the other changes on 0.9.16, I removed the column. When I connected the device again, I was back to nothing showing on the device. I have now done that a couple of times with different column types, and each time it's the same: Add or remove a column and the next time I connect my devices, it doesn't show any books on the device.
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