System Issues:
1. "GFC error: failed to initialaize the primary control theme" error loading the mod. You will recieve this error if FfH isn't installed in the correct location (under Program Files\Firaxis Games\Sid Meier's Civilization 4\Beyond the Sword\Mods). If you don't have Civ4 installed to that location just make sure the FfH is installed in the same directory as Final Frontier, Age of Ice and the other mods that came with BtS. Also make sure you have installed the full mod and not just the patch.
2. The mod loads okay, but when you go to start a game it crashes. You experience this error if you aren't running BtS patch 3.17.
3. If you are running BtS 3.17 and the game still crashes when starting your computer could be having problems playing the opening movie. Disabling movies resolves the problem.
4. If FfH crashes when starting a game and when you look in the Civilopedia from the main menu and you can't see units, then you have only applied the patch and you need to download and install the main mod (then reapply the patch).
5. While playing if your units look okay when moving but turn back to normal civ4 units when standing still its because you have "Freeze Animations" turned on in your game options.
6. Vista users have reported crashes if they have UAC (User Account Control) enabled.
7. Some sites you download the mod from lose the .exe extension on the file, so you just get a file that windows cant use. Renaming the file and putting the .exe back on the end fixes the problem.