Replace:
PHP Code:
<img alt='{$safe_alt}' src='{$user[avatarurl]}' class='avatar avatar-{$size} photo avatar-default' width='{$size}' height='{$size}' border='0'/>
With:
PHP Code:
<img alt='{$safe_alt}' src='". $vb->options['bburl'] ."/{$user[avatarurl]}' class='avatar avatar-{$size} photo avatar-default' width='{$size}' height='{$size}' border='0'/>
-Mike