In previous version, my Crop prefs were set as constrain, 8x6...   after installing 4.6.3, I changed the prefs to 'normal' so I could drag crop to any ratio...  however, it sticks at 8x6.  
I cleared the values in the h/w boxes, made sure 'normal' was still checked, and it's still constraining, but now at 1x1 (square) ratio.
I need to remove the crop constraints..  but it won't let me!