BuddyPress.org

@hnla: Thanks for your reply. I am a newbie in WordPress & Buddypress, so some things are very difficult for me. I only made the upgrade to 1.2.6 by the automatic upgrade not by FTP. The Server is a Virtual Server Managed, so I can control nothing by myself but it works like a normal server not like a shared hoster. I made no changes to the file permissions and to the server, I only made the upgrade and installed a new plugin called “Invite Anyone” and sendt 5 Invitations with that. On my next visit on the site, all Avatars where gone, but they are still on the server in their folders.