I use it too, and since my add-on folder is synced via Dropbox, I probably used it from multiple Macs, though not regularly and not recently. Is it still broken? If @amesha is right, it should be a transient problem.
The add-on attempts* to store its (very minimal) config in the Anki collection object, so should get sync’d between machines via Ankiweb, just like your decks and study progress. Part of that config is the timestamp of the last sync, presumably to avoid reporting the same datapoint multiple times.
* ‘attempts’, because that’s currently broken for me; the collection doesn’t persist the updates, for reasons that I don’t yet understand. If config sync is working for you, you’ll see sensible comments in your Beeminder datapoints, like
"anki update (+27)". If it’s broken, then the +number will be a total instead of an increment.
Tagging for @muflax