Administration Theme and the Taxonomy_theme module no longer works

I have never installed nor used the Administration or Taxonomy theme modules. The OGR module obviously causes problems with these modules. I do know OGR was modified recently to support theming by group:

/**
 * Modification as per http://drupal.org/node/183860
 * Override theme based on what group is being displayed (if any).
 * Be smart about selecting the 'active' group for ambigous urls like node/$nid
 *
 * @param
 *   none
 * @return
 *   none
 */
function og_user_roles_theme() {
  global $custom_theme;
  $group_node = NULL; // a node object containing the 'active' group for this request

  $type = $_GET['type'];

  if (arg(0) == 'og' && is_numeric(arg(2))) {
    $group_node = og_set_theme(arg(2));
  }
  elseif (arg(0) == 'node' && is_numeric(arg(1))) {
    $group_node = og_set_theme(arg(1));
  }
  elseif (arg(0) == 'node' && (arg(1) == 'add' || arg(1) == 'ognodeadd') && (arg(2) == 'book' || $type == 'book') && arg(3) == 'parent') {
    $group_node = og_set_theme(arg(4));
    $_REQUEST['edit']['og_groups'][] = $group_node->nid; // checks the right box on node form
  }
  elseif (arg(0) == 'node' && (arg(1) == 'add' || arg(1) == 'ognodeadd') && isset($_REQUEST['gids'])) {
    $gid = intval(current($_REQUEST['gids']));
    $group_node = node_load($gid);
    $custom_theme = $group_node->og_theme;
  }
  // As per: http://drupal.org/node/194214
  elseif (arg(0) == 'forum' && is_numeric(arg(1))) {
    $tid = intval(arg(1));
    $gid = og_user_roles_gid_from_tid($tid);
    if (!empty($gid)) {
      $group_node = node_load($gid);
      $custom_theme = $group_node->og_theme;
    }
  }
  elseif (arg(0) == 'og_calendar' && is_numeric(arg(1))) {
    $gid = intval(arg(1));
    $group_node = node_load($gid);
    $custom_theme = $group_node->og_theme;
  }
  elseif (arg(0) == 'comment' && is_numeric(arg(2))) {
    $group_node = og_set_theme(arg(2));
  }

  og_set_group_context($group_node);
}

Not knowing anything else, my guess is that this is probably causing the problem. So, the question is, how to resolve it? As I don't use these themes, but you do, I would suggest you dig a little deeper into what should be done to accomodate them on our end. Point me in the right direction, and I'll see what I can do on my end.

Fair enough?

Then, let's start with the Administration Theme. When I go to admin/settings/admin, and change the default admin theme, it changes and stays changed while I am logged into admin pages.

When I log out, the pages I see are the theme selected for the site.

In short, everything works as expected.

What happens when you change the admin theme on your site?

The admin pages default back to the system theme when i turn on OG User Roles, from the separate theme i picked for them.

Unfortunately, this is not my observation. OGR is already installed when I change the admin theme, and the admin theme stays changed. I can also select individual group themes that are maintained when OGR is turned on. As stated before, I can't speak to the Taxonomy Theme module because I don't use it.

I'm running the Druupal 5.5 update (all core files updated to 5.5).

Sometimes what happens is that Module A will have an effect on Module B that will cause a problem that goes away when Module B is disabled. The problem is trying to figure out if, in fact this is the case, and if so, what is Module A?

I would recommend putting up a test site so that you can more easily install/uninstall modules to test the various effects.

What i'm seeing is that with OGR turned on the anonymous user see all the themes that the site has implemented, whereas any authenticated user only see the main system theme. Doesn't seem to matter what other modules are enabled.

With which theming? Administration or Taxonomy?

Then, just need to find the module that we're conflicting with.