Need Some Help

Problem seems to be solved. I have no idea how it happened but it is working now.  

If you know why some of my pictures are not showing up in my slideshow, please let me know.  They were working fine just a few days ago.  Now you see a ? instead of a picture on about 4 slides.  When you double click to go to Picasa, the pictures are there and you can see them on the slideshow.  

Please let me know if you can figure out my problem.

Thanks!