black screen?

[bigchump]

This is caused by display driver failure.
I had the same problem back in April.
I "dumbed down" the Nvidia control panel settings and set the slider to "performance".
This helped but did not completely get rid of the problem.
Then I started hacking at everything and eventually CLOD quit doing it.
Running in windowed mode and setting res. to 1024x768 were a couple of the things I remember doing.
All is ok now although I do get a flicker of the desktop when I hit the fly button but I can live with that.
Good Luck.