1. Go to redfin.com and select a city, and a house.
This one is as good as any other: http://www.redfin.com/WA/Seattle/3215-2 ... ome/123236
2. In the center of the page there are thumbnails of photos - click through them, and the large picture will change with each click
3. Click a picture that has already been displayed
Picture is not shown the second (or any subsequent) time you attempt to view it
If I disable Adblock Plus the pictures display fine on the second attempt.