this problem i just find out also!
background story:
i bought <img src="/ubbthreads/images/graemlins/div.gif" alt="" /> (english) and it was version 1.29 i think.
updated the game to 1.32.
i backuped my saved games on cd -rom.(in win 98 SE)
then, after waiting a few months untill the new patch came.
i bought new pc with win XP pro service pack1
full install of <img src="/ubbthreads/images/graemlins/div.gif" alt="" /> and put the backuped saved games back.
then i updated from 1.32 to 1.33a.
and played further.
what i did notis was that in version 1.32 i visisted verdistis alraedy.
in version 1.33a, the map of verdistis was totaly black again. no provlem at all,
now i updated from 1.33a -> 1.34a
and for the first time i visited teh dark forest.
now i see that tyhe whole map is clear. no fog of war anymore.
question , is it possible to "reset" the fog of war in a particular map, like the dark forest?
thanks! <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />