lucy24 - 10:47 pm on Dec 9, 2012 (gmt 0) [edited by: tedster at 6:33 pm (utc) on Dec 10, 2012]
OK, so we're talking about themes for the whole operating system. Mac has never been big on those, though I've got a fuzzy recollection of having a third-party extension that did something analogous for OS 7.5-ish. It got annoying after a while. Now I don't even use a desktop picture.
Is the problem with all images on some sites, or just some individual images? I'm thinking something in the filenames that conflicts with filenames used in his OS theme.
<probably irrelevant digression>
I once ran into a mysterious situation when using my son's computer to read message boards. They had lots of smileys, but three specific ones wouldn't display. Fortuitously a site programming geek drifted by and instantly noticed that the three smileys in question were named :mad: :sad: and ... I forget the third, but you get the idea. (This was years ago. Safari has presumably long since got those figured out.)
I also discovered that I couldn't use the div name "ads" in e-books, because Camino would quietly eat the whole publisher's-advertising section :) I now use a longer name.
[edited by: tedster at 6:33 pm (utc) on Dec 10, 2012]