There are articles describing what you have presented. Your TV is set to STORE MODE. When you turned your TV on for the 1st time it should have asked you to select HOME USE setting. The STORE mode setting is what Samsung initially sets all their TV's and is used by stores on their displays so that when a Customer changes settings, in so many minutes, the TV resets Back to the STORE MODE...which is the Dymanic. If you read your Manual it will outline the procedures to follow to re-set the TV to HOME USE\MODE.
Do you fine the picture on your TV TOO bright? I do on my LN46A550....I am not sure its not as a result of watching darker TV's dosplays for years.....or its just SamSungs settings...I normally use Standard with the Factory defaults
I just bought this new beautifully designed and well equipped TV, but I am now running into a problem where when I watch a movie on HDTV cable channel and I custom set the settings for that movie. While the movie plays, the settings will reset back to it's original Dynamic style. Any help would be greatly appreciated.
Also, does this TV not have PIP for two cable/tv channels as apposed to two sources?