A:Answerit's a 60hz panel that uses post image processing to increase the refresh rate to a simulated 120hz to reduce image blurring.
samsung explains their "clear motion" technology...
http://www.samsung.com/global/article/articleDetailView.do?atcl_id=32
A:AnswerAre you using an HD cable box? Or do you still have a cable box meant for an older, "standard" TV? I was trying to adjust my aunt's HD TV and some of the options were greyed out. I researched online and found that the non-HD cable box is likely the problem.