Where has my map pack gone?

I have bought both Devastation and Invasion map packs but now I can not find the devastation one any more as it doesn't show on my list as I am choosing a game. Anyone have a clue where it is? As it stands, I can only play the original and Invasion map packs.

:)

 

Map Packs and Matchmaking

You have to be in a match where everyone in the game has the same Map Packs as you.

 

Halo: Reach - Anniversary Map Pack - player failed to load content

I have anniversary map pack and my brother has defiant and noble map pack.

When I deleted his noble map pack all the map packs were working fine for everyone on the console.

For now I'm moving the noble map pack to my USB and I'm keeping defiant and anniversary on the hard drive.

 

Just to update, I've just uninstalled and then reinstalled the Devastation map pack and I still can not see it on my list with I go and choose a game.