Body field of some nodes not displayed in teaser view
This problem might be related to the WYSIWYG editor you're using. Some of them output a lot of redundant code, so you don't get anything or a bunch of white space before content on teasers. Try using the 'Edit summary feature' that comes with Drupal corer to fine-tune teasers (or you could always have a new teaser text field). Most of the WYSIWYG editors come with a Teaser button, so you should use that.