Was using Flash 8 on a PC now using Flash CS3 on MAC X and having problems

Hello,

I’m currently creating a photo gallery displaying thumbnails of the original main image.
I was using Flash 8 on a PC and now am using that same file on a MAC OS X using Flash CS3. And now the thumbnails are not visible. The main image appears but the thumbnails do not.

The SWF created with Flash 8 viewed properly but when I opened the fla in Flash CS3 the thumbnails stopped appearing and I’m not sure what to do?

Any help or suggestions would be greatly appreciated!

Thanks