If you login to nightly2 (http://nightly2.sakaiproject.org:8082/portal) or any OOTB Sakai started up with demo users and login as one of these demo users
For instance: instructor/sakai or student0001/sakai or test/test
the tutorial won't go away. You dismiss it and it comes back on the next page.
If you create a regular account it works correctly. It should be investigated why this is, if it's a problem with the tutorial or a problem with how the demo accounts are created as it could be a problem for others that create their accounts this way.