NWBC 5 - blank screen after login & NWBC 4 - Could not retrieve navigation information from any role

Dear NWBC experts,

I am trying to use NWBC for the first time. I set up my connection as https://<server>:<port>/sap/bc/nwbc/. NWBC showed me the logon screen and allowed me to enter my user ID and password. I see problem, however, after I click log on.

For NWBC 5, I see a blank screen. There is no error message, no search bar, and not even a tab.

I then tried to use NWBC 4. After logging on, I see a pop-up window that says:

Have anyone seen these before and know how to fix these?

Thanks and best regards,

Edi