Downloaded pictures have green thumbnails

So far I've enabled two extensions, and it's working fine.

Two extensions enabled so far, images are fine. Looks like an extension is definitely at fault.

Try to enable the other ones, one by one. Every time you enable 1, close Chrome and open Chrome again. Download a jpg file and see if you can narrow it down to the one extension. Then see if you can find an alternate extension that does the same thing that the broken one does.

Well, that was a bust. I couldn't figure out why, but I was getting green thumbnails again, with just three extensions. I reset again, and I am STILL getting green thumbnails. So Chrome is no good.

Well, save your bookmarks from Chrome. Uninstall Chrome completely, and re-install it again. Try that.

Well, there's a hitch. I've had this problem for a couple years now since installing Windows 10. I've reinstalled Windows 10 several times, and each time, Chrome has pulled this crap. Even beta, Canary, dev and Chromium builds do this.

Steve C said:

You could try this official Chrome cleanup tool https://www.google.com/chrome/cleanup-tool/index.html

That's what they suggested on the Google Product Forums, too, among other things. I even checked Malwarebytes, my ESET firewall rules, and installed with the offline installer. A fresh, new install still does the same thing.

Hey, this could be a possibility. There's maybe a small percent chance that this could fix it.

Uninstall your Video Card completely.
Restart the computer.
Go to your Video Card's website and download their latest installer.
Install the Video Card and restart the computer.
Try saving pictures again from Google Chrome.

Also one suggestion that I just thought of while I was writing the thing above. Restart your computer in Safe Mode (which avoids using your video card's drivers). But also make sure to boot up in Safe Mode WITH Networking (so you can use the internet). After the computer boots up, try going to some website using Chrome and save some pictures and see what happens.

Nah, no changes there, either.