http://techforums.nintendo.com/message/126828#126828
Unfortunately, it seems another person has posted here with the same problem, but no one knows how to correct this, sorry.
http://support.activision.com/Contact_Us
So perhaps you should contact Activision and hopefully they will be able to help, or give you further information about the possibility that this is due to the update and they are working on a patch to correct this problem.
And also you could give a call to Nintendo's 1-800-255-3700 (6 am ~ 7 pm Pacific, everyday) Customer Service number, or use their webform to contact them, and one of the service representatives might also have that information.