A potential problem you may experience are instances that have defederated from lemmynsfw. This functions as a shadow ban and you might have difficulty interacting with various communities.

The other problem is that if you're the first user of your instance to attempt to navigate a community it'll often throw an error while your instance builds a cache.

The problem you're describing might be assignable to the recent update effecting your authorization token. This will naturally go away in time as Lemmy instances update their software.