Images disappear in formatted figure list

The images I have entered as references in my document appear as tiny squares above the captions. I’ve used EndNote successfully to write the separate chapters of my dissertation – each of which contain at least 50 (jpeg) images. Now that I have combined the chapters into a single document, it seems EndNote cannot handle the (approximately 150 and growing) images.

How can I get the images to reappear in the single document?? Could this perhaps be an issue with my computer and not with EndNote?