LineRenderer Help

Hello,

I am trying to connect two objects using Line Renderer which is on its own GameObject but it seems invisible on both 2D and 3D views.
The game is 2D. I have tried changing materials, changing z coordinate and occlusion culling is on but I have had no luck.

Can anyone help?

Here are screenshots showing the situation:

attach a png/jpg here
(drag & drop it in post edit mode)

Thanks