Repro Steps:

1) Create a Page
2) Using the Path Tool (P), draw a two-point, perfectly Vertical segment in the RootGrid. (using the [Shift] key to ensure it is perfectly vertical)
3) Using the Selection Tool (V), click-and-drag the Path.

Observe how the Path can be successfully repositioned on the Stage.

4) Introduce an Ellipse shape to the RootGrid, placing it behind the Vertical line.
5) Using the Selection Tool (V), click-and-drag the Path to reposition it.

Observe how the Path cannot be clicked-and-dragged to reposition it.

6) Grab one of the Paths points with the Path Selection Tool (A), and reposition it to make the line tilt at an angle.
7) Using the Selection Tool (V), click-and-drag the Path to reposition it.

Observe how the Path can be clicked-and-dragged to reposition it.

Expected Results: Vertical and Horizontal Paths of 2 Points can be repositioned using the mouse, even if there is another object behind it, in the same way that Paths of 3 or more Points can be repositioned.