Bug exists as of version 1.1.1.2 today:
By line attack, I am referring to the feature that allows one to order units to attack points along a line drawn by the user.
Steps to reproduce:
1. Make a few planes with a ground attack.
2. Give planes a line attack order (A, Alt+Click-drag, this may use Ctrl+Click-drag for some users)
Expected behavior: Planes will be assigned specific points on the ground, spread evenly along the drawn line. They will attack their assigned points.
Actual behavior: Planes will be assigned points to attack, as expected. All attack orders from the line attack are then immediately canceled. The attack order markers and lines disappear one-by-one, over the course of about a second, depending on the number of units. If the unit is close enough to attack before the order is canceled, it will execute the attack order.
Tested with Licho and Avenger.