Picture Icons won't show

Ever since I switched from Ubuntu to Open Suse I have had a problem with my icons in the pictures folders. They are the ‘busy’ icon with a clock, and not a thumbnail of the actual picture. The old pictures show, but no new ones will display. I can’t find any setting for this, rebooting does not help, and I cannot find any advice on the net about it. It is very frustrating as I have lots of pictures saved and frequently have to open several of them one at a time to see what they are.
Does anyone have any idea how to fix this?