I'm running Windows Mail on Vista. A couple of days ago, something changed, and my received mail messages no longer display any images that are displayed from external sites via HTML.

I don't get a red x, I don't get a security warning, I just get a big empty space where the image should be. The HTML is still there, I can see it in the source, and if the image is a link, that still works.

Googling for help, the suggestions all say to uncheck the "Block Images" checkbox under Tools > Options > Security > Download Images. But that is already unchecked.

Anyone have any ideas (other than a better mail client)?