Did you apply the cumulative update for SP2, we had the same issue when we did a migration a couple of months ago and just applied the cumulative update to fix.
Please take a look at this link, it is a list of all SP's and updates with links for download.
http://sqlserverbuilds.blogspot.com/
Good Luck
Chris Powell
George: You're kidding.
Elroy: Nope.
George: Then lie to me and say you're kidding.