Hi,
I have a similar issue although on a non supported hardware (GeForce 7900gs). and the answer from the tech support was "your hardware is too old". Still, the game ran fine before a given update and i spent more than 20 hours playing the game but because Larian doesn't want to support this GPU, they won't even investigate the issue.
More info here (post: #498860) :
http://www.larian.com/forums/ubbthreads.php?ubb=showflat&Number=476120&page=25Still, i have hopes that someone will fix the shader responsible for this problem. In the meantime, i let the game update to the last version (introduction of the mod section). Now not only my screen becomes black like described in my bug report but the characters also have some sort of black shading all over their body like if they don't get any light (global illumination ?).
before the mod menu update
after the mod menu update It looks like they're covered in ink.
This happens in the character creation too. Only the characters are black.
Anyhow, the black screen issue seems to be the same as Sarya's since we also can see the UI (or parts of it in her case) and still "play" while everything is black.
I have hopes that Larian will take this matter a bit more seriously now since now there is someone else with a more "decent" and recent GPU than me that experiences this bug.