Probably a glitch in the patch, delete it then download it again.
If this doesn't work either your PS3 is slightly glitched or you can't play the game for now, so I still suggest deleting it and playing Campaign, Spec Ops and Split Screen Multiplayer, until the next patch release.
If this doesn't work than let me know.
Also you must be signed off of the PSN to play un-patched games.
« Last edited by zeldafan11 on Jan 29th 2010 » Sir Alex, the Ruby Knight of Everlasting Life