A new update for Microsoft's growing list of Xbox games that are compatible with the new Xbox 360 was released on December 8th, but the update has already been removed from official servers following compatibility issues discovered with games already covered in the original backward-compatible roster.
Several games in Ubisoft's Tom Clancy-licensed series, including Ghost Recon, Ghost Recon 2, Ghost Recon 2: Summit Strike, all three Splinter Titles, including the original, Pandora Tomorrow, and Chaos Theory, and both Rainbow Six 3 as well as Rainbow Six 3: Black Arrow were included in the new update. (Only Ghost Recon: Island Thunder and Rainbow Six 3: Lockdown were missing from a full Tom Clancy complement of Xbox titles.)
As with other games released as backward-compatibility profiles for the Xbox 360, the new titles were playable in increased resolution and widescreen support. However, those who installed the update discovered that it took away such support from another important title: Microsoft's own Halo 2. After updating the backward-compatibility list, Halo 2's graphics were only available in the standard 4:3 resolution, a jump back from its previously upgraded 16:9 rendition on the 360.
Microsoft has since removed the compatibility upgrade, presumably in order to post a corrected version with full Halo 2 functionality restored in the near future.