- quickdog93
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- Senior Mythic Member
I would try to sign into xbox live before the main halo screen comes up. Then just go into custom games and choose maps. It should load for a few seconds and then all your maps (including DLC) should come up (check to make sure they're all there). Then go to matchmaking and you should be fine. I have to do this every time I want to play Halo 3, or else it doesn't recognize that I have the maps.