Captivate 7 split & resize slide problem

I have a slide(s) in a project that is set to 1280x720.

After I split the slide, for some reason, the new slide that is now created after the split, gets re-sized to some unknown size. 

The slide appears zoomed in far to close so when I now play the project, or just that slide, the screen is zoomed in so far I cannot see most of the originally required capture area.

I've tried using the Modify>Rescale Project command to re-scale/re-size the whole project back to the required size, but I just cannot get the slide after the split to go back tot eh correct/required size.

This happens for ALL slides that I Split.

Any ideas how to fix this?

Thanks.