Blank Photos in an exported slideshow

Has anyone else had problems with an exported slideshow playing back blank photos? Any suggestions? I’m using Snow Leopard 10.6.8 and iPhoto 9 on a MacPro with lots of memory. I exported the slideshow to the desktop and played it back in Quicktime.

Also, I just purchased Photo Presenter last night, so it’s the latest version.

Does that happen with every slideshow theme and also with completely different photos or just in a certain combination.