We currently have 3 XBL accounts on our Xbox. One of them downloaded three separate DLC packs for Callof Duty: Black Ops. Only the account that downloaded it can use it, otherwise it prompts the other two accounts to purchase them. This is the only case of DLC not working. Our old Xbox got the "red ring of death" so we had to purchase a new Slim console, but we transferred all data from the old hard drive to the new one just fine, including the three DLC packs. Only those three don't work. Does anyone else have this problem? Help?