Is the screen reading shader node broken in Godot 2.1 Rc ?

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By samuncle
:warning: Old Version Published before Godot 3 was released.

When I try to use the screen reading node in the shader editor it shows as a 100% black material.![enter image description here]

Here is a screenshot + the shader used
enter image description here

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:bust_in_silhouette: Reply From: samuncle

After carefully checking I discovered the issue. The mesh when reimported in Godot 2.1 had shadow casting enabled and unshaded disabled. So it caused the issue.

When the proper flag where enabled everything worked just fine.
I think it should be included in the documentation or somewhere as a reference for people with a similar problem.