I changed our address using AR-11 and faxed the forms to CSC after our move, seperately for me and my spouse in first week of July.
We called the 1-800 number to verify the status on our I-485 cases in the week before Sept 15th. We got letters from CSC in the second week of October (this month), saying that our cases are still pending, as if we dont know that.
Good thing about that is, the letter came to our new address. So, its like a confirmation that they have our new address. Its better to update the change of address by calling NSC.
-WAC-020665xxxx