profile updates

I have updated my profile through "settings" and have successfully uploaded a photo in the 120x120 pixel format requested. File size is 43Kb. The correct photo appears her next to this post but does not appear in the user box on either my home page or the home project page. On Tuesday night after one attempt it appeared briefly in the user box on the project page but, within 20 minutes had reverted to the default user placeholder image. Is there a linking problem within the site?