Maximum no. of thumbnails is 26!

Hi, thanks for looking.:afro:
I have the thumbnail scroller working beautifully, however I have over 30 images in the xml file and it will only scroll up to number 26.
I have checked, doublechecked the xml file and there are no mistakes. I’ve even swapped around the order and still it will only scroll up to the 26th image.
The action script is unchanged, it’s copied straight from the tutorial.
Are you able to help?
Thanks.