I have a recently installed R16, which I'm using with one tuner only. Today I turned it on, and it was tuned to channel 502, with an R rated movie showing. Black screen popped up with "Program rating exceeded access code _ _ _ _". I had never set any parental controls on this unit. I went to the parental controls menu, unblocked everything on all, set a new access code, and still the channel was blocked. When I enter the new access code, it unlocks the channel for 2 seconds, then the message comes up again. I reset the receiver and unlocked all parental controls, and this is still happening. What else can I do to remove this, and prevent it from happening in the future?