This has been happening to me lately. Exporting to MusicXML and importing does indeed fix the problem. It makes a cosmetic mess of some things --- all of which can be fixed without too much trouble...
These questions and answers are SUCH an important trove of resources! I needed this very thing and voila... the answer is here. WONDROUS!
That would now be here: http://www.timusic.net/debreved/finale-tips/