Hi RonH,
From CyberLink's FAQ:
http://www.cyberlink.com/prog/support/cs/product-faq-content.do?id=1919
What is Cyberlink Rich Video (CLRV) and how do I use it?
CLRV can save an enormous amount of production time by reusing video file information created by MagicCut or Scene Detection functions. PowerDirector stores the information within the files, ensuring that the next time these features are used on the same files, the speed of production is dramatically improved. You can check CyberLink's rich media technology by accessing "Preferences".
Might not be a lot of help
Scene Detection is used a lot less nowadays, when using a miniDV camera it's useful. With HD, most of us record in smaller chunks/scenes/clips.
Dafydd