Hmm . . . developing a new site, and am having intermittent issues with random images not displaying. Cross testing in IE simultaneously, and not having issues there.
When requested from the server, an image just "goes missing." No broken icon, just the alt displays. Refresh, it comes in, a different image goes missing. CTRL-F5 and same random result, sometimes it takes 5 or 6 hits to verify all pages are rendering properly.
It's sometimes CSS url images, sometimes direct in-page src=.