If you have this problem and have been waiting for support or the engineers to sort it out.
my advice is DO NOT WAIT.
you need to do the following:
delete all your images including the last one that does not delete. To remove the last one load 1 new image and delete the last of the old images.
THEN
Simply reload all your images and voila all photos restored.
there is a bug in The Photo Tour software that occurs when you allocate existing photos to the appropriate locations and this is what causes the images to fail on the click thru.
[Title updated by Community Manager for relevancy]