Problems displaying full article - teaser only My problem is that when I manually define teaser and body of the article, only the teaser displays after clicking "Read more" (the text entered in "Body" section isn't visible in any case)
I've defined max lenght of teaser to high value (2000) because I would manually set part of article which is visible in teaser mode but I think it should not impact on displaying full body.
It sounds like the "Format" for the Default display is wrong. What is the "format" value shown in http://YOUR.DOMAIN/admin/structure/types/manage/YOUR_CONTENT_TYPE/display? Typically it should be "Default". If the Default Display is set to "Summary or Trimmed", then you'll get the effect you mention, with the Summary in both the Teaser and Default versions.

You can check this by changing the settings and doing Preview on the node edit page. Preview shows the Teaser and Default versions simultaneously.

Also, is "Custom Display Settings" checked for the Full Content, or just the Teaser? Typically it would be just the Teaser. If you have set Custom Display Settings for Full Content, then check the settings as above.

By the way, &lt;!-- break --&gt; works fine in Drupal 7. I use it.