This is an awesome thread. YukoValis, do you mind if I repost this information on the Clan Quest Mod's FAQ/Known Issues page?EDIT:Better still, I think I will just post a link to this thread, because none of these problems are actually related to the mod itself so much as the game, and that way you get to more easily retain credit for making this awesome list.
@893kira, if you hear the sounds, but don't see the intro logos, just klick the mouse a few times, or press SPACE or ENTER. The main menue should work fine. At least this is what I have heard about this specific problem.
I have had the same problem too, I went with pressing ESC until the menu showed up. But I also found that playing in window mod (by adding -window after the -console in the shortcut) gets rid of the problem as well. Then by changing the resolution of the game you can have it a bit bigger on your screen.