The previous and next buttons are actually buttons not mc. There are actually "2" of each. There is a nextOver and a nextBtn, same for prev. They are all buttons, the Over are invisible, just used to apply a "hit" area. The Btn is a visible button that tweens in on rollover of the Over.

For what its worth, the reason for the "hit" area is because it rescales to match the 1/2 size of the image that is currently in the Loader.

I get the feeling that it is something simple that I'm missing. I can post the fla if it would be helpful.