From what I see on your forum, it seems there is an issue with the Patreon plugin:
Specifically here:
I believe $.cookie usage has been deprecated and dropped from Discourse, and since Ember 5 is enabled, it errors directly.
I don’t have an immediate solution for you; the plugin needs to fix this.
Thank you! This allows me to see topics and respond again as a logged-in admin. I’m not technically savvy enough to use it to troubleshoot and fix the issue though.
You can disable all theme components and add them back to see which one is the issue. Oh, it’s pretty clear that it’s patreon, I think, so I made a post over there: Discourse Patreon - #180 by pfaffman
Thanks @pfaffman and @Arkshine. It looks like you’ve find the issue and have created a fix.
Please let me know if I need to do anything on my site to get the fix applied on my installation. I tried refreshing the Patreon plug-in, but to no avail.