Mesh Disappears Mysteriously [Not a Clipping Mask]

Present in the scene panel but not in the viewport.
Not a case of clipping mask. The mesh used to appear but when I switch to node editor and back again, it disappeared.

You can see the illustration of the problem here:
https://www.dropbox.com/s/296m98iuth14ndc/BLEN03_disappearing_mesh.jpg?dl=0

Thank you for looking at my problem.

My guess is that you don’t have the layer the object is on selected. Check the series of squares that is in the header for the viewport. You should see a circle in one of them. Click on that square:
layers

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Ha! That worked. Thanks mate!