Z-Order of arcs - selection versus display

[Paolo F Cantoni]

It is possible, especially with automation, to cause a number of arcs to be overlayed - that is have the same origin point on the origin vertex and the same destination point on the destination vertex.

Lets say one arc is coloured yellow, and one is coloured blue.

You can only see one - say the yellow (the blue is hidden by the yellow).  (You think) you select the yellow arc and attempt to move it.  More often than not, the blue arc will move!  In other words, the selection Z-order and the display Z-order are NOT the same.

EAUI...

Reported,
Paolo