Gears of War 2 Map Packs...?

[Mike]

Ok so when I first got GOW2 I downloaded the flashback map pack with the code inside the case. I played it for a while, then got bored of the ranking system and quit. I've changed my gamertag a few times since, then I come back to GOW2. Now for some reason whenever I try searching the playlist "Flashback map Playlist" or join a friend who is playing in one of the maps, I can't join. It says I don't have the content

OK, so I go to redeem the code again to get them, and it says it's invalid. I'm really confused.

Sometimes it lets me play these maps on local or private match, sometimes it doesn't. I'm starting to get really pissed off about it, doesn't anyone know what's happening? I'm going to have to end up buying the pack for 400 Microsoft Points (which isn't a lot, but why should I when I bought the game!?!?)

Thanks for any help or advice, greatly appreciated!
UPDATE: I just looked at my hard drive memory under Gears of War 2, and it says I have the Flashback Multiplayer Map Pack installed... WTF?
Ok thanks Milk, I'll go try that right now. I got more help from you then on the xbox forums themselves
Ummm I deleted it from my hard drive so now it doesn't appear in my download history... Thanks anyways...

 

[Milk84]

It sounds like the problem is because of the name changes. As long as it's still the same account just with a different name, you can fix it. The code has already been redeemed and can't be redeemed again. Delete the map from your hard drive. What you need to do is either open your account info in the My Xbox area and go to download history or find the map pack on the Marketplace again. For either way, the map pack will be listed with a check next to it showing that you downloaded it before. Select it and download it again. That should fix it.