Please ensure when using Readmore that if on Joomla 1.5.x you're actually creating the Readmore divider. If using Joomla 1.0.x please ensure you've correctly added information to the Readmore input when creating a new blog/article (am not sure how MyBlog creates articles, but perhaps does not support Readmore?). Ensure the CBSubs Content integration is publised as well as the CBSubs Joomla plugin.