Clipping Autos in 3.0 LiveSpecced MM, no haste procs, stable at 66 ms and 30 fps (due to fraps), you can see several autoshots delayed by casting a steady just before the auto should go off. Also I activated steady shot from the spell book directly to make it clear the problem isn't due to any old macros.
Oddly enough AotV still seems to proc a mana gain where you'd expect the shot to fire.
Live servers, Oct 15 2008