Leaves, Branches disappear in viewport on Tree Creator Object

I’m using Unity 4, and I’m working with the tree creator for the first time. Occasionally, when switching windows, the leaves and/or branches will not draw in the viewport or game view. When I select them in the tree creator interface I can see the controls in the viewport but not the mesh.

I’ve tried setting the properties to hopefully force a redraw, and I’ve also tried reloading the scene and restarting Unity.

Has anyone else had a similar problem or is it just my machine?

Got it working…I had hidden the tree element by clicking on the eye icon on the branch or leaves node. I didn’t even see that the node had changed.