Rebooting the PC doesn't change anything. The next time I restart Calibre and plug in the Glo, it may not happen even though I don't reset the device and start with a new database. I may be able to add a few books next time, and then if I want to add a few more or delete something within that same session, the error will then pop up.
Actually now that I think about it, doing multiple transfers or deletes during the same session will just about always trigger the error.
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