I don't recall this problem being reported before...
Did you try leaving the area (ie teleport back to the battle tower) and returning?
Maybe try reinstalling the game, or with the Steam version verify the local cache.
Try emailing support@larian.com, with a description of the problem and maybe a link to this topic. DKS
support page.
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).