Moving Frames = Jagged Edges

OK, so I am putting in the preloaders on the 4 sites that are due today, things are going great - very happy with everything.

The second I move the main site elements to frame 3, to make room for the preloader going on frame 1 -> when i export this all the edges on every picture/background have gone freaking jagged!!

I have isolated this as an issue occuring right when I move the frames over. This is really odd, anyone have any ideas??