First, ensure that your photos are no larger than 1000x750 pixels in size each.
Then render your timeline by pressing Enter. (The red line above all of the photos on your timeline will turn green.)
Also, ensure that you have the latest version of Quicktime, which supports this program.
If you're still having problems, it could be related to the amount of free, defragmented space on your hard drive.
I resized the picture but still no luck.
I'm interested to hear the results of my other suggestions.
By the way, what are "Photo-Jpeg quicktime files"? These could well be at the heart of your problems. What type of camcorder did these files come from and how did you get them into your computer?
Okay it's exported, the problem was there wasn't enough space on the hard drive to save the file AND go through the process of rendering. Oh and Photo Jpeg is a codec for quicktime. I've used it many times, as it is very good at preserving quility with a small file size.
Glad we could help you find a solution, Leoneo.