By alignment arrows I assume you mean the arrows that appear in the middle of each line, curve, or spiral?
4 things...
I do believe he is refering to when you create the alignment and it asks you "Do you want to accept current alignment direction" and then an arrow shows up.
I have ran into the same problem and have not found a solution.
I've had this happen when I'm not in World Coordinates.
Switching the UCS should get the arrow to show up.