Since a couple of weeks, you've probably noticed some weirdness with the download of the pictures. Not all the time, strangely, but frequently.
Personally, I first thought that it was a problem with my computer, because at the same time I had other problems with that same computer, and also because no user had reported any issue.
But after a while, I've understood that it was a more global problem. It took me some time and a lot of head scratching to find out the origin of the problem: 2 out of the 5 image servers were badly configured !
All the servers are now working fine. I apologize for the inconvenience you've suffered.