Curved Surfaces change to 'Frame'

@JohnMike wrote:

Hi All,

I am still finding my way with sketchup.

I am confused by the behaviour of a curved surface.

When I move an edge across the surface the face disappears and a wire frame appears in it's place.

Why does this happen? how can this be prevented?

Before -

Pasted image745x464 7.23 KB

After -

Pasted image756x459 7.89 KB

Rebate Door Master.skp (218.1 KB)

Thank you for any advice you can give me.

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