@ExperienceOz Are you using a custom theme or fork of a theme? That may explain the user icons not working.
I notice you have gravatar forced on at the moment, so I can't test user icons.
Thanks @julian , yes ended up forcing Gravatar as a stopgap just so something appears rather than broken image links. We are just using Lavender that has a few CSS modifications to it but nothing that should affect core functionality.
They were working fine before the latest update is all. Would you like me to deactivate Gravatar temporarily so that you can have a look?