Try deleting all of the files in the '
..\Divine Divinity\Run\Dynamic' folder.
This folder is used as a cache for the game. Files are created / copied there from the save game folder when you load, and written / copied from that folder when you save a game. The files will be re-created as required the next time you start Divinity. If there was a corrupt file in that folder, deleting the files should fix the problem.
This isn't really a cut scene problem itself, but try running the configuration program and switching to software mode, and maybe reduce the resolution. Then try starting Divinity and loading that save again.
If this, or an area effect spell, do not help, you may by able to use the trick in
Josephine herself stuck in the wall, though I will have to find an appropriate save. Email me, and I'll send you the file (I don't have enough room left on my web site for it).
PS If Poison Cloud does work, use
iZakaroN's SaveEditor to give yourself the points to max it.
