If you're going to post a whole bunch of messages in the span of an hour without any replies between them, go to Edit and append your new material to your previous post. When you fix a problem, you should also post how you fixed that problem so the next person looking for a solution doesn't have to go through this all again.
What's in your crusade.cfg? Try "v a904 z" The briefing room lockup is probably connected to your broken sound.