I have a similar issue in that I cannot see any content on my desktop computer, and the interface is telling me I have blocks disabled when they are not, and that I do not have permissions when I do. On my mobile I can see everything. I've tried clearing all the caches, and doing a hard restart of the page and that did not resolve the issue.

Update: I have also been able to trigger the permissions denied notification if i interact with another tab then go back to World Anvil.

I have triggered this bug-error on both my PC and Laptop.

This has happened multiple times over the past weeks.   Using Chrome and new interface - I get a message saying I'm trying to access something reserved for Guild Members when I'm only typing in text (generally in a side panel). Then it will tell me something has gone wrong and do I want to autofix, which I do, someitme it works, sometimes I lose what I've just typed, other times it throws me out of the article.   I've resorted in some instances to using the old interface to input the text and I haven't encountered the same problem.