I don't recall seeing this reported before. I assume you tried reloading the save before going back to Broken Valley, or just leaving and returning to see if having the game load the area again would make a difference?
Did you try doing a clean re-install of the game?
Uninstall D2:ED/FoV, reboot, shut down all non-essential programs (especially anti-virus), make sure there is nothing left in the D2 folder (saves are stored elsewhere), then install D2:ED, FoV and the patch.
Try emailing support@larian.com (see
FoV support), with a description of the problem and maybe a link to this topic.
In XP the saves are in the folder
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Savegames
or in Vista / Win 7
C:\Users\ %username% \AppData\Local\Divinity 2\Savegames
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).