After running CCleaner, images on the thumbnails for Craigslist are not there. If I click on the ad the image comes up in the ad but not on the thumbnails while searching for an item under each section. I am using IE 11 on windows 10. If I use EDGE then it works ok, so the problem is with IE 11. I tried contacting Craigslist and Microsoft to no avail.
I'd say that it's probably CCleaner clearing the thumbnails from IE11.
But it may be Internet Explore itself that is not displaying them for some reason.
In CCleaner are you running Health Check or Custom Clean?
EDIT, it may also be a craigslist setting, did you run the Registry Cleaner in CCleaner?