User profile page title is mistake I use login toboggan and profile2. Now I'm logged in as "user1". The I logout and login with "user2". When I then go to the user profile page of user2 I see "user1" in page title.

Clearing the browser cache isn't a solution.

Clearing DRUPAL cache works (but at the moment DRUPAL cache is disabled). Then I see the right username in page title. Is it possible to exclude the user profile page data from DRUPAL cache?
Caching in metatag coused the problem. Disabling the metatags for users solved it.