Me, and other people, recently have problems with embedded picture display. Sometimes pictures in posts don't show up, while they properly display when accessed directly, via URL.
I have already discussed this with others, who have the same experience. It seems only to happen with Google Chrome, with Firefox and Opera everything works fine.
This is the latest example I saw: viewtopic.php?f=276&t=291573#p1444388
I can't offer an explanation. Pictures from my own server share the same fate. While they are all produced as JPEG images with PAINT.NET, nothing special done. I just reworked an image of mine with Paint 3D, same result:

Direct link to the same picture: http://www.hoerfehler.de/media/ETS2/bug ... no_lod.jpg
I checked it in incognito mode, same result. So it is not a rogue Chrome extension.