Hi Footyblogger,
I started experiencing this right after the update as well. It only happens on some images.
I deleted all inactive plugins, but that didn’t fix it.
I don’t have the WordPress Firewall 2 plugin installed. Do you have any idea of what functionality in that plugin that was causing the trouble?
I’d prefer not to have to deactivate plugins on a live site, but I will if I have to.
Thanks for starting this thread!