Deparments menu missing on navigation pane (Nav 2015)

I am extremely new to nav . I have a nav 2013 database which i successfully restored on a different server. I have converted that DB and my new nav 2015 point to that db . I was able to successful log on with RTC using windows authentication, but realised that the department menu on the navigation pane is missing. I tried adding it but all i get is an empty list table. Any help will be appreciated.
Thanks