I checked it on Windows XP 32 bit. Works (well, to be accurate "Doesn't work") exactly the same.
I thought that maybe I can fix it by lowering GammaCurve, but no luck.
GammaCurve: 1.0 (default)
![Image](http://img600.imageshack.us/img600/219/enb20121211222855.th.jpg)
![Image](http://img839.imageshack.us/img839/3293/enb20121211222920.th.jpg)
GammaCurve: 0.5
![Image](http://img28.imageshack.us/img28/6587/enb20121211223140.th.jpg)
![Image](http://img694.imageshack.us/img694/7931/enb20121211223133.th.jpg)
The shadows look fine from some distance, but they get that dark, when I come closer.
EDIT: Same after downgrade to 12.4 catalyst. Also, it's the same indoors, so it's not skylight problem.