Most of the time, moving islands around is pretty easy.  But if you're having trouble, try these tips:

  1. Check the number of islands on your page.  Limit the number on a single page to 10.  If you need more islands than that, create a new page and add them there, then link to that page using the Hyperlink manager.
  2. Look at the Titles in your individual islands.  Remove any character that is consider punctuation.  For example.  If you have a title of What's Up with That?  Modify it to be What s Up with That   
    While not grammatically correct, it will allow you to move islands around on the page successfully.