Blocking isn't working, can't view my notifcations, both get the weird error screen, is anyone at all still working on kbin, is anyone out there to assist in fixing these things?
The Devs are hard at work, there is just a lot for them to do. You can see the most recent PRs here. You can raise an issue here for more visibility: https://codeberg.org/Kbin/kbin-core/issues
Are you blocking the individual users, or the domain? I've heard that domain blocking is buggy, so try unblocking any domains and see if it helps. It also isn't supposed to block instances, just posts that link to the blocked domain.