Can't play customs; help required.

I got a problem and I’ve never ran into it except today.

Any gametype I try to load in custom games that’s no on disk, you know, a custom gametype, attempts to verify, says the name isn’t allowed on LIVE, and kicks me off the LIVE network under networking settings. I have to dashboard and launch the game again to get the network back to LIVE. This is happening on Reach also, but it doesn’t kick me off the network at least. The same may happen in 3 also, I don’t know.

I’ve tried everything. Redownloading profile, clearing the cache, tons of stuff. Custom gametypes and maps just don’t work. Everything else works fine, even Matchmaking. Customs is just being non-compliant. I need some help on how to resolve this.