If your avatar image is missing or broken, you most likely uploaded a file compression that’s not recognized in our system. You could very well have used an acceptable file type such as a gif, jpg or png, but the file compression may have an issue within our system.

Solution:

Try to re-export this file in your editing software (i.e. photoshop) and upload again. You could always revert back to the default avatar from your Edit Profile page.