My whole scene dissapears but it is still there

Please help! I am working in my unity game, I saved it and when I came back to it all objects dissappeared but they still exist in the scene even though they are invisible, when I try to test it (playing it) they are there and no longer are invisible. No errors appear in my console. I have tried zooming in and clicking two times on the object but still nothing Maybe it is the mesh renderer? I dont think it is because it is activated and it appears in the game. I am using unity 3.1 Did any of this happen to anyone else? Thanks in advance