Windows 10 No pictures on some sites

I'm using Chrome on Win10 (latest updates). When I visit some websites through Thunderbird (which then accesses Chrome as the default), I get sites with no pictures - not all. I tested the problem by accessing the same websites with Opera directly, and do get pictures. Pretty sure the problem is with a setting in Chrome, but I can't find anything that looks like it can be the problem. Any help would be appreciated.

P.S. I get some iffy responses from Chrome occasionally, like a box with the statement "Windows cannot access the command..." when I click a URL. But then If this is related, it would certainly make sense.