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How To Setup Avatar Usage
There appear to be quite some confusion, problems and usage issues with avatars, this is to clear that up.

First, go through the options:

• Overal usage of Avatars
  • Admin Control Panel > vBulletin Options > vBulletin Options
    • Here you can set the overal usage of avatars. If you want users to use avatars, turn it on here. If you want only certain usergroups to use avatars, still turn this on.
• Custom Avatars
  • Admin Control Panel > Usergroups > Usergroup Manager > Edit Usergroup Permissions
    • Here you can set on a per usergroup basis the permissions to use custom avatars and if so, which sizes, etc. If you only want certain usergroups to use avatars, set their permissions to yes here so they can upload their own custom avatars.
• Regular (Default) Avatars
  • Admin Control Panel > Avatars > Avatar Manager > Edit Avatar Permissions
    • Here you can edit the permissions for avatars per avatar category for usergroups. If you only want certain usergroups to use the default avatars (and only certain categories), you can set this here.

Secondly, do a chmod 777 on the images/avatars directory through your ftp client or through your shell client, so uploaded avatars can get saved properly.

Hopefully that helps!