I have an inbox crammed with unread messages. I okayed the new image behavior, checked a few messages and noticed how google loaded images without asking me, which is fine, I did agree on that.

I then reverted back to the old image settings but when I open unread messages now, they also have their images loaded automatically and without asking me.

Either the "revert back to original settings" are broken, or the caching of images is done when I enter my inbox, for all unread messages.