user photo doesn't appear

Hi guys

I came through this problem when I tried to upload a profile photo to my the admin account. So I uploaded the photo but all I saw was the default image unavailable error photo. I then tried to remove it but I couldn’t. I tried uploading the photo once again from the front end from “my account” page with the same problem. I went to the discussion settings of wordpress to double-check that the “show avatar” checkbox is ticked, and it was, but saw that all the default avatar images disappeared.

How would you get them back and make them show again? At least better than broken images show on the site.

Thanks guys