Welcome to the forum brobinson01
1) Just to rule out the obvious, after saving your project did you move any of the photos to a different directory or change the file names?
2)
Prior to this incident were you able to save your projects and edit them at a later time?
3) After re-opening this project can you see your photos in the "1 Organize" tab view?
4) Could you try burning a DVD of your project. If the photos show up on disc (but not in preview mode) it might tell us something.
Lastly, just FYI, Ulead doesn't monitor this board (at least not officially) so you may want to submit a tech-support ticket, assuming you aren't using the trial version.
-Mike