[tbworld]

The only problem you are having is your target. As @Cellarius stated the variable you are trying to use is incorrect.

The following will work in MEMBERINFO template, although I did not check the dateline param which I should have added -- if possible.

   <img src="{vb:raw vboptions.bburl}/image.php?{vb:raw session.sessionurl}u={vb:raw show_userid}" />

I did not have much time to look into this, a bit busy with life. Your code should have worked on hook "member_complete" with variable "$vbulletin->GPC['userid']", but for some reason it did not. I will take a look at it later.

--------------- Added 29 Jul 2014 at 22:04 ---------------

The hook code works fine. I had missed creating an actual avatar for the test user. That stuff happens when you are juggling too many things.

    //Hook: member_complete

    require_once('./includes/functions_user.php');
    $avatarurl = fetch_avatar_url($vbulletin->GPC['userid']);
    vB_Template::preRegister('MEMBERINFO', array('avatarurl' => $avatarurl));