Pretty sure all of your graphical views were on the legacy backend. if that's the case you're gonna have to start again since mango 3.7.7 is leveraging the dashboard display with the dashboard editor in which you make entire pages and charts yourself.
@zaaphod Mango has jetty embedded into it and will configure it when Mango starts. I'm not sure what you are implying here. If you start mango via it's startup script you should see Mango on port 8080 by default.