Error when inserting teaser break (Drupal 6)

I'm having a similar issue, though it doesn't look like much support is being given. Mousing over the teaser break button shows that it recognizes it as the correct button, but when I click on the teaser break button, nothing happens.

Any help would be appreciated. I'm running Drupal 6.

There's no teaser break included in the default CKEditor files, so you should ask this question in the Drupal forums related to CKEditor.

http://drupal.org/node/814970