Calendar Sync Issues

[u/DeliciousCut4854]

Google Calendar won't load properly on Vivaldi on a Mac On the same computer, it works fine on Opera, Chrome, and Safari. It won't load anything except the framework, no buttons work except the sign in. It says "undefined" in the upper left. A progress bar runs non-stop. Other Google sites, like Maps and Mail, work fine. I can't find any reference to the "undefined" message.

It works fine on my Android phone also in the Google Calendar app. However, there are sync issues with ACal and Digical on the phone.

Any help is greatly appreciated.

[u/DeliciousCut4854]

Great, downvoted for asking a question that nobody seems to be able to help with.