have u tried just makin the image plane from a poly plane and asssign the images in hypershade. for the plane under its channel box just put in the image size which cant be found out in photo shop. then move it to position - freeze transformation so i u move it by accident during moddeling u can put in the value of 0 and it goes back to place and then assign it to a layer and set it up as reference
- or is this how u have done it if so do it so thatin the view u go
view - image plane - import image and do it that way