At MIL visiting for holidays and she has SD U-Verse. There is supposed to be a free HD preview 12/29 to 1/5. We are hooked up HDMI and I set the box for 1080i and can see the guide but it won't display programming. Some of the HD channels do show a preview in the guide but when you select it just goes to a black screen. Is the preview not on until later or is there something wrong with this box. She has U300 and a VIP1225. Missing my Hopper badly.