Gimp and iPhoto problem?

Ok so I'm trying to make a stop motion film where something floats around, so I went to Gimp and did the steps to erase the rig and I saw it was in iPhoto and it showed the floating thing on the thumbnail, but when I double clicked it to enlarge it, the floating thing just disappeared and I was left with just a background and no floating thing. Can someone help me with this?

 

Sorry for the extremely late reply, I assumed that no one was going to answer. I think I've figured out the problem, as I was making the photo editing process much too hard and realized that all I had to do was just copy, paste, then erase. I'll try it again and see if it works now. But thank you so much for the reply.