jc....is your little 'charactaristics of preview' bar up top with the little 'navi' bar?

It may be hiding the navi bar so you have to slide it over a bit to the left.  You'll see the choice between camera and cubic mapping.  If you don't see it at all, you may have to click on 'mask' to the right to make it do so.

When using the camera mapping, I stop using Alt lmb and leave my pen/mouse up top and use those instead. Gives me lots more control....