Looks like a typical connection problem to authservers, often caused by any network issues in between your client and our server, including security software and any other filtering stuff. I don't see how reinstalling can solve that, but I'm happy it did! :)
Yes, assumed some local software being the cause. The release build still has development mode active, which was not intended, but actually helpful to investigate some issues people reported, so we decided to keep it active until the first hotfix.
devtrackers.gg