Has anybody seen this one before? Got a second AM21 for a new HR24 and set it up exactly as I did the one on my HR44. First time through, it did not list a few available channels. Did the initial setup again and this time it comes back with the missing channels listed, but now several others had disappeared. Finally, after re-doing the initial setup for about the 10th time or so, all the available channels were listed and available. Why such an odyssey? I thought the channels listed were in a database based on my zip code and not based on a scan? Very strange, especially considering I only had to do the initial setup once for the AM21 on my HR44.