Quick question about Loaded Movies malfunctioning

After completing Kirupa’s “Create a Photo Gallery” tutorial by sbeener (http://www.kirupa.com/developer/mx/photogallery.htm), I exported this movie into a SWF file, and tried to load it into a holder MC in another flash movie.

However, when the parent flash movie is exported, all actions, masks, buttons in the SWF file are gone, leaving only one still image. And I did not change any of the coding from the tutorial.

[COLOR=DarkOrchid]I am a beginner, please feel free to help me, even if the answer is quite simple & obvious. Thank you![/COLOR]