Regarding the Xbox 360 achievement anomalies, "The Xbox Live servers don't seem to be fully synched yet with the additional achievements," Bethesda explains. "This should fix itself automatically soon. People won't lose any achievements."
Original: The third Fallout 3 downloadable content pack 'Broken Steel' has been released for the Xbox 360 and PC, and many PC gamers are finding it is, well, broken.nope
The Bethesda forums bear reports from a number of PC users that Broken Steel fails to install, giving the error message "Not a cryptographic message or the cryptographic message is not formatted correctly. (Exception from HRESULT: 0x8009200D)."
For now, Broken Steel has been pulled from the Games for Windows Live Marketplace. Bethesda member 'Dermot'--victim of the bug himself--states "We are looking into it."