Google Chrome latest version: error
Mozilla Firefox latest version: ok
Opera 24.0 (latest version): ok
iPad 2 with today's iOS update:
Safari browser: same problem, just for a second when touching the arrows on left and right side of the photo.
Screenshot almost not possible, because the icons are there when moving mouse pointer over the photos, and when holding still the mouse the icons immediately disappear....
Well, after a lot of trying I managed to capture the moment that the icons appear.
Please have a look at the screenshot.