In a recent update we added some performance improvements to our addons -- which involves running some components of the addon features on our servers, for which your calendar will need to be logged in to access.
If you find that an addon has been deactivated, please be sure your calendar is logged into the Timely Network under:
Events > Settings > Viewing Events tab
This action will register your website URL with our API, allowing any addons to recognize your calendar.
Note: Both, your add-on, and your core calendar, should be in the same account for your addons to work.