I have Blender installed on 2 PC's. On PC (a) if I go into component mode and have the transform gizmo visible, I can select a vert and then individually select the neighbouring verts through the transform gizmo. The gizmo does not block selections... on PC (b) however, I cannot do this. It will instead try to trackball rotate the first selected component, even though I am not dragging the mouse, but stationary clicking. The transform gizmo is blocking the selection.
I have compared, by eye, all the preferences etc and they are identical. Is there an option or a toggle somewhere that would cause this behaviour? being able to select through the gizmo is pretty necessary for me.