[NTG-context] backward compatibility [URGENT]

Hi, re-typesetting a book (that was last set with ConTeXt ver: 2007.08.09) I had to see that several pages now have a different line- break (and so the page-break and the TOC and the index register are changed) ... quite a mess. I guess is not so easy to find out what changes in the ConTeXt source result in these changes now. So to continue work it will be probably better to downgrade again my ConTeXt. Is there an easy way to do this, like using sudo ctxtools -- updatecontext and use the respective files from the museum? Thanks, Steffen