I was having the same problem earlier today. I did all the normal dump
cache, cookies, temp files, check IE settings, etc. It was quite
frustrating.
I had run Spybot S&D just yesterday and was clean, but decided to
check another spyware/adware program. It found OverPro on my machine
and removed it. After a reboot, success! All images are back.
Try
http://www.spywareinfo.com if you continue to have this problem.
One the left hand side of the screen under Site Nav, click ONLINE
SPYWARE SCANNER, and remove anything it finds.
Hope this helps resolve your problem the way it did mine!