File download puzzler!

hey there, i’m experiencing i strange occurance that i just cant solve with flash. I have a flash based site which you can download files through flash so you dont leave the site. This happens by upon a button press a small movie clip loads in the top of the main timeline with a script to download the file from the server. This works fine locally and download fine from the server but when i upload and test to the server some downloads work and some dont load the little download movieclip, even tho they all work locally. If anyone has any ideas i would be most grateful. cheers. i would post some example flas but the movie consits of many other files so is hard to demonstrate.:disco: