After I logged in the I got only the hint 'Import is finalizing' but nothing more. It does not depend what I select. I got always 'Import is finalizing'.

What should I do to get the 'overview' or create a quarter report?

BESServer, db2, etc. seems like so that they are running. Filesystem has enough space.

Should I restart all services to fix this problem?

I restarted all services manually and afterwards it worked.