I would simply try a third browser, like Chrome or Opera, or even one of the newer no-nonsense browsers, like Pale Moon, on these pages, to view the missing thumbnails, for the following reasons:
1. There's still the possibility that one of your add-ons is blocking the thumbs, because they're tied to some ad/tracking cookies. The temporary disabling may not have helped diagnose the problem, since perhaps, Adblock Plus blocked the thumbs when you had Avast disabled, and vice-versa.
2. I wouldn't use IE, because there could be some possible malware situation involved with these thumbnails, unless you absolutely trust the site (and their ads) and the poster you're getting the photos from.
3. You may get a lot of ads, without ABP, but these other browsers are relatively safe from potential problems from sites such as image hosts.
Ultimately, if the thumbs show in another browser, I suspect that it's a combination of 40+ & ED's solution. I've found that Firefox requires frequent refreshes on images from image sites, I think because they're not being cached properly, with some sites and servers being worse than others.
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