Well, that's the problem - Drivers are up to date for my 8800 GTX -- 169.44, the ones recommended, and DX9, too. The issue with clipping has gone away since I reinstalled it, but the game just flat out will not accept FSAA, whether in game with HDR disabled or enabled, or either way with it forced in the drivers. Don't know what the problem is, but I'm betting HDR because it usually screws up AA, depending of course on what kind of HDR it is.