If everything is fine in the diagnostic tools, but chat windows remains empty: it can be a Websocket issue.Since Peertube version 5.0.0, there are some additional configuration to do on the server side.Check with the instance administrators that they did not forgot to apply changes listed in the [Peertube v5.0.0 release notes](https://github.com/Chocobozzz/PeerTube/blob/master/CHANGELOG.md#v500).