"Word Cannot read the formatting in this document"

I'm on a Mac but using a virtual machine to run Biblioscape on Win XP and using Word 2003. I have several times in the past compiled a draft to RTF without a hitch but now suddenly it doesn't work. How to get it to work?

Were you using the notes

Were you using the notes feature to compile notes to a draft? Or simply formatting a rtf document with temp citations?