Place the gate in the middle of its travel and test that from this position the gate can move either direction.  Do this by clicking the button then after it has moved one direction about a foot or two clicks the button again.  The gate should stop, then click the button again.  The gate should move the other direction.  If it passes this test then it is the magnet alignment.  What happens is the magnet gets mistakenly placed where it trips both the close and open sensor because they are positioned vertically.  Once this happens the gate will not activate in either direction because the controller is confused