This worked:
- If you want to center the elements to the centerline of your canvas, then Command+A (Ctrl+A)
- If you want to center to an off-center element make a marquee selection, PS will use its center point to align (vertical or horizontal, depending on what you're trying to center
- Now, Command+Click (Ctrl+Click) (or Shift+Click) the elements you want centered.
- Press V to get the Move Tool and click the align button up top that you want (vertical or horizontal)
- Your elements should be centered according to where your marquee selection's center point is.
Cheers!