How can i fix this 
What kind of gameobject?
Where do you place it?
What kind of crash message(s)?
Shapes like sphere,cube,capsule,etc
and also if i click on a asset in the place where it stores all your items
and when it crashes it says Unity Editor has stopped working.
I also have not restarte my PC, i might go ahead and try that.
It still has not fixed
i have a windows 8