Day one purchasers of Borderlands on PS3 were faced with an unpleasant surprise on Tuesday: the game's co-op mode is completely borked.
Fix’d! From the Gearbox Software Community:
Gearbox has worked very quickly with its partners to identify and resolve the issue users have been reporting with the PS3 version of Borderlands relating to friends lists on PSN
We are very pleased to report that using PSN friends lists with the game should now work properly for all PS3 customers. The fix has been released invisibly and should work automatically for all PSN users on the PS3 platform. No special action is required by PS3 customers to apply the fix – just play the game and you’ll find that everything works fine now. We thank you all for your patience and for making us aware of the issue!