And if you think the fog of war is an annoying bug, be glad you don't have the one I have that crashes games on loading 100% of the time.
Have you tried renaming ..\Documents\Larian Studios\Divinity Original Sin\ to something else like ..\Documents\Larian Studios\DOS
this resets all config options and savegames
You should be able to save/load again at this point. If not, be sure to let us know.
Nope, I changed the directory name, (and the game couldn't see the previous directory's saves, so I know I changed the right thing) started a new game saved it after the first couple tutorial messages were done.