For a while, I was having the problem of not having my assets import. Now after I upgraded to 10.6, that is fixed. But now, even though the assets import, nothing shows up in the editor window where you can add to and edit the game itself. I get the following error message:

!IsNormalized (dir) UnityEngine.Camera:ScreenPointToRay(Vector3) UnityEngine.Camera:ScreenPointToRay(Vector3) UnityEditor.HandleUtility:GUIPointToWorldRay(Vector2) UnityEditor.Handles:SetCamera(Camera) UnityEditor.SceneViewRotation:OnGUI()

Any help would be appreciated.