Limit to number of images in a file?

i am encountering the strangest bug. i have scrolling thumbnails moving accross the screen, about 50 in total. each is a JPG image imported into flash. the scroll is then duplicated to create the effect of a never ending scroll.

when i export the movie, this is what happens:
http://www.lousch.net/bau/bug/prod_pack_lipsticks_plastic.swf

(you’ll notice the first few images are completely “smudged”). i can’t seem to figure this out - has any one ever encountered such a problem?