If that doesn't work, if you have HD-PAK, tune in or record HD-NET Test pattern on TUesday morning.(I think) See what your OVERSCAN is.
921's have a bad habit of pushing the edges way out cutting off text. I've contacted Dish, but they deny any problem. (HA!)
Your screen should read 5%-6% all the way around on the last test pattern.
YOU can have your display ISF Calibrated at a cost of $400-600. It would eliminate your monitor as the source of overscan.
If enough people complain, maybe Dish will fix it. (Ha!)
Hope it is just a setting though.