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If this happens to you, exit the game to the XMB screen. Press X to start the game and hold down all of the R1+R2+L1+L2 buttons to do a deep scan. Hold these down until the Game Assets bar starts loading. That method should do the trick.
FYI - I located this fix on the official forums as well as this board, but for some reason, many people don't use the search feature. So certainly this topic will only be useful while it's on the first page....
GameFOX for Gamefaqs Firefox users is a must have add-on.