I own Call of Duty and the expansion, United Offensive. Recently, while the multiplayer server I was in switched maps (to a map I've played before in a server I play on all the time). Toto 1.0 for mac beta. Before the server could even load the new map I was hit with that error message that my 'CD key is not valid.' So I put in the UO disk, and entered my CD key.

Still no good. So then the CD key showed up as correct, but I still could not join a server because my 'CD key is invalid.'

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I go back to multiplayer options and hey its typed in and the correct key is staring me in the face. I deleted everything Call of Duty and reinstalled both the original game + UO. I saved all my maps (I had like a bagillion and didn't want to re-download them all).

Put in CD-keys for both CoD and UO, and then joined a server. I played a game, yay, but as soon as the server loaded a new map, again, I had an 'invalid CD-key.' I go back to multiplayer options and yeah, the correct CD key is still typed in. I'm getting pissed. I've had the game for like 2 years.