edtmark,

Try adjusting the Film Mode option on the television to see if that helps with some of the judder you're experiencing. If you change the option on television for the input that the Blu-Ray player is connected to, it won't affect the other input that the cable box is connected to - the inputs are independent.

The only other option I can think of is to adjust the film mode option in the Blu-Ray player.

--HDTech