Photos don't display on Ipod - blank boxes, scrambled

Question

I have a 60gb ipod color photo.
On the Ipod, I used to be able to display my photos perfectly, but now when I go to the photos all that shows up in their places are blank boxes that when I click on turn to a scramble screen. It doesn't freeze, just shows the box in the place of the photo, and the scramble screen in the place of the selected photo. This is a problem that occured over time. What happened and where do I go from here?
Ipod Photo Color Display 60gb    

Answer 1

Did you duplicate the existing book or create a new empty book and add the same photos?
Have you tried rebuilding your library as follows: make a temporary, backup copy of your library if you don't already have one (Control-click on the library and select Duplicate from the contextual menu) and  apply the two fixes below in order as needed:
Fix #1
Launch iPhoto with the Command+Option keys held down and rebuild the library.
Since only one option can be run at a time start with Option #1, followed by #3 and then #4 as needed.
Fix #2
Using iPhoto Library Manager  to Rebuild Your iPhoto Library
Download iPhoto Library Manager and launch.
Click on the Add Library button, navigate to your Home/Pictures folder and select your iPhoto Library folder.
Now that the library is listed in the left hand pane of iPLM, click on your library and go to the File ➙ Rebuild Library menu option
In the next  window name the new library and select the location you want it to be placed.
Click on the Create button.
Note: This creates a new library based on the LIbraryData.xml file in the library and will recover Events, Albums, keywords, titles and comments.  However, books, calendars, cards and slideshows will be lost. The original library will be left untouched for further attempts at fixing the problem or in case the rebuilt library is not satisfactory.