IE6, 7 and 8 do not display JPGs saved in CMYK
Just learned a new thing about CMYK JPGs and IE. Aparently the two do not mix. In these three browser versions (6,7 and 8, could not check older versions) JPGs saved in CMYK colourspace would not load and simply display a “red cross” (a.k.a. missing image) placeholder.
IE9 however behaved well, and displayed image without any hickups.
The solution was rather easy, load JPG in photoshop and just resave it. I guess any other image converter tool would do the trick too.
A few more words re this issue could be read form this page.