I deleted a plugin by mistake which has resulted in any user uploaded avatars no longer showing beside your names.
The images are all still in the uploads section so you can go and select it again.
If you used an external image you will need to enter the url again
Sorry for the inconvenience.
You can also register at gravatar.com with the same email address you use here and upload your image there, it will be pulled through to this site automatically (it’s what I use)