Double click your move tool to open up the move tool attributes, then look at the discreet move to see if it's checked or not. If the move tool attributes are open and you press the letter J or maybe Shift J, then it can turn it on.
see picture to see what I mean.
I am so sorry to reply to this old thread but..
I found another way to turn off the annoying auto snapping tool.. So yeah look at this image below:
Well when I done my work half way through, the auto snapping tool begins to on for no reason.. and it gave me headache after the tool starts to on again and again in my later works. So yeah I disabled it by simply pressing the "Snap to Grid' icon. After turning it off, have fun continuing your work. 
Last edited by vinniejip; 29-06-2015 at 09:09 PM.