Bell_Flyer-
Only thing I can suggest is a complete reinstall of iLife 09, sorry... also, it helps to make absolutely sure that you're using the same issue of iDVD and iPhoto so that they talk to each other properly.
Thanks Booglebox. That's not the solution, unfortunately.
I went to an Apple Store this morning, created a slideshow in iPhoto with the 'scrapbook' theme, sent it to iDVD and the problem is still there. I spoke and showed it to an Apple 'Genius' and he said it is a bug that only Apple can fix.
My advice - don't upgrade to Snow Leopard if you need to produce Slideshows via iDVD. It all worked fine on Leopard.