Navigation possibility missing

Hello everyone,

I was logged in to the application Octane (probably customizing on site level) and during this the DB Server was rebooted. Since then I get an error when I want to login to the server, please see in the attached file.
I can login, but I cannot navigate because the indication of the actual workspace is missing.
Problem 1: how can I get again the navigation possibility?
Problem 2: At the error message, there is a Correlation ID (this time: ji10m327y882vc6pler5zda35), what can I do with the correlation ID, where can I find further information (I am a system administrator)?

Octane: 15.1.60 on Windows

Please help me?