They're not blocking Calibre specifically as far as I can tell. The Overdrive plugin uses search.overdrive.com - if you've never visited this directly it used to have a modern asp/json interface for searching. Now when you visit it from a browser you get automatically redirected to their 'classic' search interface, which uses an old-school form.
The fact that they've gone from modern to old and clunky seems to indicate some sort of upgrade/repair is in the works and the modern search is offline for the time being.
Since the classic interface basically requires a complete re-write of the plugin I'm going to cross my fingers and wait a week before committing to that.
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