Very good Point, but unfortunately I only have the masterlayer set up.
Now i tried to make a new layer with all objects but the same problem.

The objects have the same material but except for the spheres and the checkerplane they dont catch the area lights.

If I turn the arealights off they render exact the same. But the spheres and the plane become dark as they should become. :/

I tried to change the user ibl env to a normal IBL with final gather, but same problem.