Not turning on for some textareas.

I can confirm having the same issues. I just switched to having wysiwyg off by default, but a proper fix would be preferable of course.
I googled for this, and checked the tinymce forum, but couldn't find any info reserved names for textareas yet.

The 'log' textarea is disabled by default (Yeah, I know this should be documented). That's because folks were reporting that they couldn't edit the log field since it's not tall and tinymce covers up the field entirely. This behavior can be changed by overriding the tinymce theme function below.

function theme_tinymce_theme($init, $textarea_name, $theme_name, $is_running) {
  switch ($textarea_name) {
    // Disable tinymce for these textareas
    case 'log':
    case 'img_assist_pages':
    case 'caption':
      unset($init);
      break;

    // Force the 'simple' theme for some of the smaller textareas.
    case 'signature':
    case 'site_mission':
    case 'site_footer':
    case 'settings][access_pages':
      $init['theme'] = 'simple';
      unset($init['theme_advanced_toolbar_location']);
      unset($init['theme_advanced_toolbar_align']);
      unset($init['theme_advanced_path_location']);
      unset($init['theme_advanced_blockformats']);
      unset($init['theme_advanced_styles']);
      break;
  }

  // Add some extra features when using the advanced theme.
  switch ($theme_name) {
    case 'advanced':
      $init['extended_valid_elements'] = 'a[href|target|name|title|onclick]';
      break;
  }

  // Always return $init; !!
  return $init;
}

This was fixed by reinstalling the module.

Looks like we need a exception added for trackbacks, too. TinyMCE seems to add a BR tag that the trackbacks module doesn't like.

See this patch which fixes the trackback issue you mention