WordPress 2.9.1 Upgrade

When WordPress 2.9 was released, I upgraded but trackbacks were not sent out. I reverted to 2.8.6. WordPress 2.9.1 corrected that but another long-standing problem I have been facing still remains. Trackback links successfully sent out remains in the “to_ping” column instead of moved to “pinged” column in the database. I wonder if this problem is unique to me or the server that this blog resides in or one that other WordPress users are facing too.