I installed R6V2 on my xbox hard drive along with the DLC maps., which then proceeded to toast itself.

One new xbox later, I've reinstalled the game and maps, but it never seems to recognise the map's existence. I can play them on solo TH, but if I try and join a game using them I cannot connect and it tells me to download them.

Anyone know a quick fix or shall I just uninstall everything and reinstall again?

I have the same problem with the DLC maps. Sometimes they're there, and other times they're not. What I do is go into the Ubisoft page from the Extras menu (just like you were downloading Streets again) and once I'm on that page, I go back to the main menu and the DLC maps are all there. Weird, but it's quicker than redownloading everything.

Buy a PS3, they work fine there!