For some reason today the virtual photo album broke. I fiddled with it for a while and then decided it was about time I re-wrote some of the ancient code. Basically it was feel growing pains. I re-wrote the file naming portion and while I was in there I linked the thumbnail creator to a newer image processor that does a much better job.
I also added some error correction that prevents errors when attempting to delete partially uploaded images.
Some images that uploaded today lack the thumbnail. You should delete these from the album and re-upload them