No camera icon in TinyMCE toolbar

This is the same issue as I reported in http://drupal.org/node/182015, but that thread seems to be inactive, so I'm trying again here.

The drupleimage Camera icon is not showing up in my user's TinyMCE editor.

I'd appreciate your review of the installation steps I took, as I'm apparently skipping at least one important step.

I'm running Drupal version 6.2 on a www.opensourcehost.com server, which is one of the recommended Drupal hosts.

The relevant modules that I've installed and enabled (under Administer >> Site Building >> Modules) are:

* Image 6.x-1.0-alpha1
* Image Assist 6.x-1.0-beta1
* Image Attach 6.x.1.0-alpha1 (I'm not sure whether this is needed)
* IMCE 6.x-1.0  (I'm not sure whether this is needed)
* TinyMCE 6.x-1.1-dev

Also:* TinyMCE 3.0.8 Javascript from http://tinymce.moxiecode.com/download.php
The relevant directory structure and files are:

* public_html
  * sites
    * all
      * modules
        * image
        * imce
        * img_assist
        * tinymce
  ==>     - plugin_reg.php (see comment below)
          * plugins
          * po
          * tinymce  (TinyMCE 3.0.8 Javascript from http://tinymce.moxiecode.com/download.php)
            * examples
            * jscripts
              * tiny_mce
                * langs
                * plugins 
                  * advhr
                  * ...
                  * directionality
          ==>       * drupalimage (see comment below)
                    * images
                    * langs
                  * emotions
                  * ...
                * themes
                * utils

Administer >> User Management >> Permissions

* image module -- all options enabled 
  (create images, edit images, edit own images, view original images)
* img_assist module -- all options enabled 
  (access advanced options, access all images, access img_assist, use original size)
* tinymce module -- all options enabled 
  (access tinymce, administer tinymce)

Administer » Site configuration » Input formats / Configure Allowed HTML tags: ... <span> <img>

\public_html\sites\all\modules\tinymce\plugin_reg.php
Per TinyMCE's install.txt, I added the code so that the bottom of this file is:

  $plugins['drupalimage'] = array();
  $plugins['drupalimage']['theme_advanced_buttons1'] = array('drupalimage');
  $plugins['drupalimage']['extended_valid_elements'] 
     = array('img[class|src|border=0|alt|title|width|height|align|name]');
  return $plugins;
  }

\public_html\sites\all\modules\tinymce\tinymce\jscripts\tiny_mce\plugins\drupalimage
Per the Image Assist Install.txt instructions, I copied the drupalimage
directory from Image Assist's setup files to this deep directory location.

Administer » Site configuration >> TinyMCE settings
Create a new TinyMCE profile with these settings:

* Basic setup
   * Roles allowed to use thie profile:  authenticated user (and others)
   * Default State: enabled
* Visibility  (default)
   * Show on only the listed pages
     node/*
     user/*
     comment/*
   * Buttons and plugins
     * lots of them like Bold and Italic
     * DrupalImage (the Camera icon is displayed)
   * Editor Appearnce: nothing unusual
   * Cleanup and output
     * Verify HTML: false
     * Apply source formatting: true

Image Attach module installation instructions

  1.) Enable the Image Attach module at:
      Administer > Site building > Modules
  2.) Configure Image attach at: 
      Administer > Site configuration > Image attach
  3.) For each content type that you want to be able to attach images to, go to:
      Administer > Content management > Content types > Edit
      and review the Image attach settings for that content type.

I did the above step (3) for all content types:

     * blog entry
     * book page
     * forum topic
     * page
     * story

The Attach Images options I used were:

     * Attach Images: enabled
     * Teaser image size: thumbnail
     * Teaser image weight: 0
     * Full node image size: original
     * Full node image weight: 0

Do you see anything missing in the above configuration that explains why the drupalimage camera icon doesn't show up in the user's TinyMCE toolbar?

Thanks!
-- Mark