Gui 3.4 on MacOSX, no hirearchy, no default scene with demo

Sorry about that question, but I just start with Unity 3.4, and using the angry Bots demo, I have no Hierarchy except the camera and nothing is displayed on the scene view.
I try to select a scene ( I have LightmapFar-0 (click on it then do a ‘F’ on the scene view
but that dosen’t change anything.

any clue why ?

I try to remove this version put version 3.3 in place, then again 3.4 in place still nothing sho up.

But I can build the game an play with it !!
thanks for your help

Double-click on the AngryBots scene (has Unity logo icon).