Well, since I've deleted that particular savegame, I must reconstruct things.
Getting the focus back - why, since I cannot see anything ?
Everything on the minimap is displayed totally normal - I can even see blue & red dots (party & enemies).
I could play on - using the minimap only. But that's nonsense, see ? <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
The bug happens seemingly in those very rare cases (I#ve seen them several times now), when you not only see the enemies in the "black area" as red dots on the minimap, but also when you can *reall* see them ! It's like looking through a crack in the wall or something. <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
Then the hammer gets its focus, I mean it "knows" where to land on (enemies, of course <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> ) , and then everything gets black - except UI and minimap, of course.
Saving and reloading brings the normal sight back, but anytime I use the hammer, even on normal enemies in sight-line (I've tried this), the game "crashes" again insofar that everything gets black - like I described.