Are you trying to edit the existing chapter, or trying to add a new chapter?
If the issue is with editing the existing chapter, may I ask how you posted it originally, and from what word processing software?
If the issue is with adding a new chapter, and you're not getting the RTE properly, double-check the java-script settings. It is found in Advanced Settings > Content Settings > Java, and you should have it set to allow third party scripts. If this is already correct, then again, it may have something to do with the word processing software, and how the chapter is being added, i.e., using the text area and pasting from Word.