If you are having the problem with the black city screen could you...
(before reinstalling vista for this issue, civ4 was originally installed on C:\)
S:\Program Files\Firaxis Games\Sid Meier's Civilization 4\Beyond the Sword
S:\Program Files\Firaxis Games\Sid Meier's Civilization 4\Beyond the Sword\Mods\Fall from Heaven 2 024
Vista Ultimate build 6000 (XP does not have this issue on same box)
GeForce 7900 gtx(x2 sli)
retested
working city screen: core, A, B, I, J
blank city screen: C-H, K-N
I apparently skipped H-L, so reinstalled and tested in order: core, B, C, H, I (exited game 6 times and restarted, each diff civ), J (exited 3 times), L, delete, core, K