loadMovie problem

JPG file sometime can be loaded into flash MC, sometime cannot from a server.
for example XML Gallery/SlideShow

there is no problem if all the image file are loading locally, but if I loading image from a server, by MC.loadMovie(http://www.server.com/001.jpg); the flash movie display nothing sometimes, but occasionally it displays the picture.

I’m very confused and haven’t found reasons yet. any one has ideas?

thanks in advance.