I have been working on a scene from a cgtalk thread
http://forums.cgsociety.org/showthread.php?t=370846
I am having a problem with an area light. I cant get rid of that shadow around the dock. The relay dark line?? I cranked up the light in this render so the problem is clear.
the .blend
http://www.bestsharing.com/files/ms001102953/lighttest3.blend.html
Ok
it was the sea floor the object had multi materials when I imported it. trashadow was not on for some of them. all the materials had the same color so I didn’t see it in the 3d view.