BuddyPress.org

Thanks JJJ. Here are the steps:

1. Log in as a member

2. Go to the “change your avatar” option

3. Browse to a new avatar photo, say new.jpg

4. Press “upload”, which will take you to a page where you can crop your avatar

5. Drop out and go to some other page without completing the process

If you then look in blogs.dir in the member’s folder you will see “new.jpg”. The process never completed, so this image wasn’t deleted.