Problem with the body field after upgrading to 7.7
Are you using OG?  Because that could be causing the issue.

Things to do 


If OG is installed, but not enabled delete it.
Clear Cache
Update all modules up to their most recent versions
Run Update.php (do whenever a module is updated or deleted)
Uninstall Views and reinstall it


Issue about this problem here > http://drupal.org/node/1001060