I've been having a problem recently with the modpacks. I tried searching this thread for help, but I don't think I did it thoroughly enough, so if this has already been solved, I am sorry.
I've noticed that occasionally when I create the mod pack, all sound in the game stops working, past the Firaxis logo. There is no title screen music, no button click sounds, no unit animations, nothing. However, this problem does not occur when I am creating the mod pack. If I open up a game of regular Civ, and start a modded game with the mods in the pack, all of the sound is still there. Clearly there's something in the creation of the mod pack that's causing the problem, but what?