Version 1.2.2 is up. After a while, calibre will notice it and prompt you to update.
@soleta - Once you have 1.2.2, you can go into plugin config->personal.ini and add a line:
(Don't add another [defaults] line if you already have one.)
That should keep the plugin from writing any tags to calibre. I'd turn on 'Keep Existing Tags' on the 'Basic' config tab, too.