Some of the links on this forum allow SMF, at no cost to you, to earn a small commission when you click through and make a purchase. Let me know if you have any questions about this.
Interestingly when I right click the img tag and try to open in a new window, I get the Google login as if the image is not publicly shared. When I log in I get the "minus" image which usually means that the image is not available or has been made private.
Is there a chance that you moved the image to a new album (which might change permissions)?