This CVar turns the circle under a selected person/pet on and off.

This CVar wasn't used until an issue cropped up the day after Patch 2.0.12 released. This CVar fixed a ERROR 132 crash for those with out of date graphics cards in Tempest Keep caused by selecting a person/pet while they're standing on a transparent floor ^[1].

Default Setting

1

Possible Settings

0 

off

1 

on

Changing this setting

In-game, type the following

/console objectselectioncircle setting

Alternatively, you can exit wow, open the Config.wtf file, and add the following line:

SET objectselectioncircle setting

Patches

Patch 2.0.12 (2007-04-03): Added either this patch, or sometime before this 

References