Hi, if you get an error regarding an issue with "ConfigProvider", the simplest solution is to remove the config.json file. You can find instructions in the troubleshooting part of the documentation: https://docs.zettlr.com.
Then, do you mean logging into the forum? If so, I've seen a few instances where people got shadowbanned from the forum for no reason; I suspect a bug. If you send me an email with the address you tried to log in first, and a bit of context, I can take a look.