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We eventually found that the site in question had been added to the "exceptions" area in the options beside "Load Images" (under "Web Features"). The strange thing is, he has no idea how to get into the options dialog, no idea where the exceptions box is, yet that one site was there!
This isn't the first time either, not long ago the option "for the originating web site only" somehow became checked and Amazon's images disappeared. Same story, he has no idea how that could happen.
Has anyone else noticed this strange behavour in FF? I'm beginning to think he has begun sleep-surfing...