Dragging center point of cube won't drag all edges to corners with it I'm so sorry if this is a horribly asked question but I am very new so I do not know all the terminology yet. I however do have pictures so that I can show the problem. 

What I have now:


What I want is instead to have the left and right corners to form edges like:


But right now that only happens to only 2 of the corners. How do I get it to drag all 4 of the corners when I translate the center vertex?

EDIT: It appears the corners that this happens will change depending on my shading
Rendered: 
The corners that do not follow are next to each other now. 

All others: Above, opposite corners
The problem is that your faces are non-planar (read this) and therefore need to be converted to triangles to be displayed (Blender will do this without telling us).


Showing us the render wires, make the triangulation apparent.

It is possible to trick Blender into triangulating the nonplanar quads in a different order.


Remove the faces in question and recreate them with triangles.

Select the adjacent faces in the correct order and join them with &#9095; AltJ.

Note, that the correct order is dependant on the vertex index which can be shown only with debug options enabled.


But this is not useful. If you want the area to have an edge explicitly define it with the correct topology.





In the reference video, the same behaviour occurs.