I'm having the same issue, seems to only happen on the quick reply.
--------------- Added [DATE]1318982410[/DATE] at [TIME]1318982410[/TIME] ---------------
This worked for me,
open up /includes/class_core.php
Change this line to the dims you want
Code:
* The maximum sizes for the "small" profile avatars
*/
define('FIXED_SIZE_AVATAR_WIDTH', 130);
define('FIXED_SIZE_AVATAR_HEIGHT', 130);
Not sure of this is the best way, but it worked for me.