This question is in reference to Atlassian Documentation: Unable To See User Avatars In JIRA - Only See Default Image
All settings are set correctly as in the article above, still people don't see the avatars. They actually dissapear, and may come back next time you login. I can always see my own avatar, but from other people they regularly dissapear.
One of my colleagues said, that when he checked his avatar in his profile, it disappeared there as well. And he had to set it up again.