Those errors usually mean websockets are not proxied correctly, make sure your nginx setup is correct. If you are using cloudflare you need to disable acceleration. They don't support websockets on smaller plans.
[solved] Can't save settings
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@julian yep. Did that several times after resetting the plugins. And no matter how often I stop and start nodebb, it won't magically work. That's a real problem
I can invite you to take a look at it via TeamViewer. But I cannot show you more than you already know and see. -
@Giorgio-Chiodi I experienced this problem just now, although I resolved it by updating my vanilla and lavender to the latest versions: