newbie to unity, Terrain tree problem in unity5

I’m newbie in unity and I download unity 5 and start learning
My problem is when I painting tree at terrain the right-bottom appear “8/11 CreateProbeSet | 1 jobs” and a little lag, then after wait for about 10sec-20sec the word will disappear and did not lag, but all my trees pop out with something like “white color sphere”, I don’t know how to solve it
please help me

They are gizmos, you have to deselect them.

This is LightProbeGroup Gizmo, turn it off in gizmos, or off “Bake Light probes for Trees” in Terrain settings