Upgrade process can take a while depending on the size of projects portfolio. Make sure that nobody accesses Sonar and do not refresh the web page during setup. The web page will be refreshed automatically at the end of upgrade. To monitor the process, checks the logs and / or the console.
Migration is completed when an analysis has been run on project. Only at that point will you get new functionality working for sure.
The first analysis after migrating to 1.11 can be very long, due to a new purge mechanism that was added.