Which map is all black, everywhere or specific areas (Rivertown, Verdistis, Dark Forest...)?
If you load an earlier save, do you have any problems?
If so, try deleting all of the files in the '
..\Divine Divinity\Run\Dynamic' folder. If you have the
patch installed (or you bought a re-release version that was already updated to 1.0034A, as shown in the bottom right corner of the main menu) and reset the configuration files at least once after a crash when prompted, the dynamic folder should already have been cleared.
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.
Check the number of files in the saved game folder of the last game you loaded (in '
..\Divine Divinity\Run\savegames'). If one of the world.* files is missing, the game will replace it with the default version, which will reset the fog-of-war (shroud.* files), as well as re-seal any quest opened locations and remove any items left directly on the ground.
If an earlier save is ok, you may be able to copy the relevant shroud file into a copy of your latest save (just in case this doesn't work, or causes a problem), to get the fog-of-war cleared to the point it was in the previous save.
A new game should have 22 files, after going to either Verdistis or the Dark Forest it should have 27, after going to both it should have 32, after getting to the wastelands it should have 37, and after getting to the Black Ring dungeon it should have 42.
Different file extensions are associated with different areas of the game;
.0 / .x0 = Rivertown (Aleroth, Ars Magicana, etc)
.1 / .x1 = Verdistis, Council Hall
.2 / .x2 = Dark Forest
.3 / .x3 = Black Ring dungeons
.4 / .x4 = Wastelands