I know I don't use Word, but I know a lot of Word users, and therefore it may be worth mentioning that the cure for a lot of Word problems that do not respond to more obvious solutions is to "Maggie" the file. This method has been promoted by a lot of Word and Windows newsletters including Brian Livingston's Windows Secrets and Office Watch and is deceptively simple:
If you are having problems with a Word file, try Maggie-ing it, which is to set up a new file, then copy all the text from the old file, except for the final paragraph return.
The final return is the key to a lot of the formatting, and therefore to a lot of formatting problems.
The Maggie process is named after Maggie Secara, a copyeditor in the USA, and a very good editor that I'm pleased to have among my contacts for those seemingly unanswerable questions which every editor faces at some time. She is also an author of a major work on life in Elizabethan England - see http://compendium.elizabethan.org