I rendered this scene and found there was a problem with the lighting. The soft shadow sampling worked fine but there was this pixelated mess of a shadow on some of the objects and planes.
Help!?
You may have duplicate objects overlapping
Remove any duplicate objects that are in the same location as the object you want.
Remove doubles (select all vertices and W / remove doubles)
Recalculate normals (select all vertices and Ctrl+N)
cheers for the help 