This problem can be quickly rectified by removing all louvres from the headrail and then tilt the hangers 90º to the window using the control chain at the end of the blind.  Rehang the louvres in the open position, the blind will now open and close as required.

Simply close the blind fully and tilt the louvres so you can not see out of the window.  Continue to pull the tilt chain to realign the carriers.  You may hear a slight clicking noise when this realignment is performed which is completely normal.