For any of those having issues with the costar and the Xfinity Comcast PVR box. I recieved it earlier last week and although the STB worked, the apps wouldn't interact with the cable box. Vizio released an update recently where now as you set everything up you get to choose the Cable provider and now is capable for the apps to interact with your cable box. In short, reset the Vizio co-star (there is a reset button at the bottom of the little box), and re-do the getting started guide. In the part where you set up the STB you will have a choice to select the Cable Provider (the first time didn't have that), and now you should be able to change channels from the apps.