I had this effect for a while in CB 1.0.2 and now after upgrading to 1.1 it still is there. My avatar disappears after a while and instead will show the "No Image" picture. I upload my avatar again through CB to the server and my personal picure is there for a while. If I browse the directories where CB pictures reside - I can see a newly created picture resembling my avatar. After a few logins/logouts from frontend and/or backend (can't tell if this matters) the avatar is gone and the resembling picture in avatar folder of server disappeared.

I assume it is something about chmod of folders or files. I am on a linux server.

Who got an idea what this could be?
Thanks for every answer.