I'm confused about exactly how to split a DVD using Clone DVD2. Where the confusion is when I select the portion I want for the first disc, burn it, then go back, 'right clicking on the first entry and choosing "invert for split" checks all the video titles. Then, if I uncheck any of them, the section that was chosen below the preview window disappears and I have to click on the movie title (the first one) to get the edit points back. Am I doing something wrong?
I used this 'how to' for the instructions;
http://www.elby.ch/en/products/clone_dvd/manual/usage.html

Also, why does the "preserve menus" have to be checked??