After the all the images are displayed and Book Flip starts over, the first and second images are reversed, i.e. the first image is on the right page while the second image is on the left page. Yes - it does make a difference to me.

I patched the script by reversing the first two images after the first pass.

The author (@http://www.burmees.nl/menu/bookextended.html) seems to have fixed this problem as well as adding some extensions.