So I am fairly new to FFH and have just been playing the last few weeks. I finally went Infernal this most recent game. Game was going fine til Avatar of Wrath showed up, at which point the game would not end the damn turn. After waiting for 30 minutes I just ctrl+alt+dlt out of Civ4. Went to open it back up and load the game and when it loaded the unit pics were removed from all units, leaving blank spots on all tiles. When I tried to play a regular game of Civ the same thing happened

Am re-installing, but anyone have any advice?
I can't add anything to help more than Emptiness said, but I can explain a little bit.
Unfortunately, you have encountered what is often called the 'Avatar of Wrath' bug. If you search the forum, you will see quite a few references to it. As Emptiness said, it appears to be a hit-or-miss' issue. We know some games get an endless loop (sometimes called a 'WoC' error, standing for 'waiting for other civilizations', which flashes on the bottom of the screen endlessly) and sometimes it doesn't.
Unfortunately, we don't know how common it is, because people who don't encounter it usually don't say anything, and a lot of people don't get high AC's so they don't get the Avatar of Wrath often. Obviously, nobody knows for sure what is causing the bug. We do know that the Avatar of Wrath itself isn't causing the bug (if you go into the worldbuilder and kill the Avatar of Wrath, it won't help unfortunately).
The 'leading theory' is that it has something to do with all of the units that are getting enraged, but again that view is largely an educated guess.
I wish we could help more. For now, try the steps Emptiness recommends. However, I haven't heard of the bug causing other issues or affecting base Civ in any way, so you may be having a different issue.
If all else fails, send the save game from the turn before, two turns before, and the turn after, and I'll see if I can fix it, but I have the worst grade for this bug. I can usually fix other WoC bugs but I can't ususally for this bug. (This probably means that eliminating the unit or a unit that is causing the WoC means that a different set of units get enraged as the check goes to a differnt set of untis, making the bug effectively unfixable from the worldbuilder).
Best wishes,
Breunor