You should check the path of your "bytes loaded" actionscript part of the preloader in the external swf. If you're using loadMovie into a movie clip holder for the external swf and your preloader in that movie is looking to _root for the total bytes and bytes loaded it will read the main movie as loaded.

__________________
Employment & Education - Docemus.org
Hype Energy, Red Bull, Monster at Enerealm - "Declare your energy independence"