I get the same thing but on a 5.9 Deluxe.
It is not a fresh install.
The console output:
Session management error: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
FMain.ReadCharsets.193: #45: File or directory does not exist
WARNING: circular references detected
Weid thing is, I think it actually worked before, so maybe some upgrade broke it?