I’m getting this error on two different sites, both running the latest version of the plugin (4.4.30.1). (One site is live and the other is in development.)
The sites’ main calendar pages are set to List view by default. This error happens any time I am on the main calendar page, click on an event, and then use the browser’s Back button to go back to the calendar page. The calendar page briefly displays the cached List view and then a fraction of a second later, this error appears and the page switches to Month view.
This appears to be an AJAX error. The browser console is reporting:
Timer “List View Ajax Timer” does not exist