I've discussed this before, but at the risk of being redundant...
optique, you're image in the message above is just sitting there with the little orange balls moving. It shows no image name, file size, nor how many times it was viewed. If I hover my arrow pointer over the balls a magnifying glass appears but is non-working. If I slowly
move the arrow pointer around the outside of the dark box that contains the magnifying glass I can find a sweet spot that causes the arrow pointer to turn into a finger pointer. I can then click and an image appears. When I close the image the little balls are back. Interestingly, everybody's images in the thread are acting the same way.
As for a large group of photos posted in a single thread, it seems that everyone of them have to be downloaded before an individual one can be viewed. So when you've got ten photos of 5mb+ that can create a traffic jam.
Even as I get to the end of this message...the orange balls are still dancing. Oh, and I had to walk off from the computer for a few minutes being as I got interrupted by a couple of Jehovah Witnesses.