Apparently this plugin does "Mark Book" on all books it changes or adds ISBN to.
This has not been visible before but Calibre 1.6 is now showing these temporary marks.
IMHO the plugin should default to NOT do this because it may well interfere with actual marks set by the users. It might provide a configuration option to do so or offer it as one of the buttons (after it's run).
It's also why it sometimes triggers the Calibre 1.6 bug referenced above (which relates to marking and unmarking books).
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