With the new 0.95 version of nGlide you can now play Divine Divinity in Glide3 again.
The advantage of this is, that the light effects will look a lot better.
To enable this just install nGlide and change the graphic mode to Glide3.

For owners of the GoG version:
There is a trick to get this working in your version, too, but keep in mind that most of the new resolution won't work anymore.
What you need is the old configtool.exe from the normal version. Rename it and copy it to the main directory of the game. You can then use it to change the graphic mode.
If you want to, you can try to use the new configtool.exe to get your favorite resolution. I only got 1280x1048 working, though.