Our website is in flash. it has pre-loaders in each swf file.
when browsed through internet, the pre-loader script starts from 0 or initial follwed by entire swf file. but the problem is here - in some files the preloader doesn't appear for few minutes and all of sudden it appears from 70% onwards.
Something must be holding it up so it's not displaying the first 70%. Does your preloader work fine when you run it during developement? Try running the movie from there and see if you get similar results.