I installed that hack just to see what was up. I got it working fine. i tested it with an avatar and with no avatar.
in global.php I changed
PHP Code:
$bbuserinfo['user_avatar']="<img src='{$bbuserinfo['user_avatar']}' alt='Edit Your Avatar' border='0'>";
to
PHP Code:
$bbuserinfo['user_avatar']="<img src='$vboptions[bburl]/image.php?u=$bbuserinfo[userid]' alt='Edit Your Avatar' border='0'>";
in the navar template I changed
PHP Code:
<if condition="THIS_SCRIPT == 'adv_index'">
<a href="profile.php?{$session['sessionurl']}&do=editavatar"><img src="$avatarurl" border=0></a>
<else />
{$welcome_avatar}
</if>
to
PHP Code:
{$welcome_avatar}