Can you create a new character at the start of FoV? (just to see if it is an issue with the beginning of FoV or the transition itself)
Try setting the game resolution to be the same as the desktop resolution, if it wasn't already.
[PC] Support FAQ - The Dragon Knight SagaOne person with a crash moving from Farglow to Broken Valley avoided the problem by temporarily switching to window mode (
Solution to crash (black screen) on XP).
To try, open the graphicoptions.xml file in a text editor, and in the line
Fullscreen="1" change the 1 to a zero, save and restart the game.
In XP this file is in the folder
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Profile
or in Vista / Win 7
C:\Users\ %username% \AppData\Local\Divinity 2\Profile
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).
I'm not sure what the name of the cutscene video is at the start of FoV (the files are in the '...\Divinity II - DKS\data\Video\Story' folder), but it should be obvious (IIRC all the FoV videos start with EXP_). You could try playing it in WMP (though you already updated the audio codec, so it should play fine in Windows), or rename it to get the game to skip playing that video (which may help with the transition into FoV).