[themes] drupal_render() problem

[Matt Funk]

Hi,

i am somewhat new to drupal and so this is probably a trivial problem. I am 
playing around with theming (i.e. trying to learn how to).

Anyway, on my site i have the loggintoboggan module enabled and i would like 
to change the appearance of the login block. Currently the block simply 
displays the login/register link. I did not want to touch the module so i 
thought i'd override the function. This is what i did:

- i looked at loggintoboggan.module and found the 'user_login_block' case
- in my template.php i added:
  function  phptemplate_user_login_block($form) {
    return _phptemplate_callback('user_login_block', array('form' => $form));
  }
- i created user_login_block.tpl.php which contains:
  <h1> SOMETHING </h1>
  <?php
   print "<pre>"; print_r(array_values($form)); print"</pre>";
   print_r(drupal_render($form));
  ?>

The 'SOMETHING' is displayed properly as well as the printing of the 
array_values. However, the call to drupal_render(...) does not seem to do 
ANYTHING.

What am i doing wrong? I am using drupal 5.0.

thanks
mat