From what I can tell, this is a result of Opera's default setting that protects you from malicious websites. Many of these images, especially the ones that can be clicked to expand are viewed as malicious due to having embedded links. If you disable this feature in settings (at your own risk) it should allow these to be shown again.

@sgunhouse Just posting what worked for me. With the setting on the images come up as broken, most of them being banner images. Once I turn it off, they appear again.

From what I can tell, this is a result of Opera's default setting that protects you from malicious websites. Many of these images, especially the ones that can be clicked to expand are viewed as malicious due to having embedded links. If you disable this feature in settings (at your own risk) it should allow these to be shown again.