MovieClipLoader loads but missing sounds

I’ve got quite a big game almost finished so I’m just working on the preloader - the preloader had to be put into a seperate flash movie so that it would load properly without loading most of the sounds which are the bulk of the games content.

I’ve managed to get the preloader working using MovieClipLoader, and the progress bar works etc, the game comes up and I’ve locked the root which ensures the game runs fine…the only problem I get now is that all the sounds are missing!

Anyone know how to fix this problem?