If that's on tournaments then your database cache may need to be rebuilt. If your database isn't that large click "Database -> Database Management", click on your main database then "Rebuild Cache -> Full Cache Rebuild". If you have a large this could take awhile so schedule accordingly but you can create a new database in the meantime. If that's not the problem please capture this trouble you're having in a log file and then send that to us in a
Support Ticket so we can see what is going on here:
Tutorial: Reporting A Problem