Round Corners v2.6a

[JPC2j3]

I am just learning SketchUp and Round Corner.
I installed v2.6a sucessfully as well as the latest library manager.
Two questions:

1. I did something to make the context menu go away. How can i get the context menu back?

2. I must be doing something else wrong. Whenever I try to round a corner, the shape goes flat. I am trying to round some corners on a rectangular box. I select the edge and double click. The box goes flat.

I have attached the file for reference. I marked a corner that I have not been able to round.

I aam using SketchUp Make 2013.

Thanks

John

[cotty]

There's no model attached...