This plugin will make a default avatar show for all users if the user does not have an avatar. This works in the postbit, profiles, and members list. It uses the image "images/misc/unknown.gif" by default, which is used in several locations for the same purpose, and works on vB 3.7+ and vB4. This is editable in the Admin CP under vBulletin Options -> User Picture Options -> Default Avatar Image Location.

Updates:
1.0 - 3.5 release by Zachery - unsupported.
2.0 - Initial 3.7+ release.
2.0.1 - Slight bugfix relating to users disabling avatar display. This setting does not affect avatars on the profile or memebers list by default, so this addon should not take it into account for those pages.
2.0.2 - Added a setting to control the location of the image. See the updated description for details.
This works for vBulletin 4.0 as well as 3.7+.

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