Last Friday, 10/19, I modified my setup slightly. I have two powered, indoor antennas. I have these set about 15 feet apart, in opposite corners of a room - connected with a coupler, and then output to the AM21, which is connected to my HR34. I had a show that had recorded the previous Saturday, and it was somewhat pixelated. So, I decided that it was time to do an adjustment on my antennas. I set it to that station, went to the signal level screen, and adjusted the antennas until I got the strongest signal that I could. It started with a signal about 40 and I was able to get it to about 80. After this, I checked some other stations that were "fringe" as well, and they had better signals. So, I thought - "Why not do another Initial Setup" and see if I could pull in some more stations in my area. I put in my first zip code, and it went to "Searching ..." (sorry, I don't recall the exact message at the moment, but it is what it says and then comes back with the city/state that it finds for that zip code. It hung on this screen for about 10 minutes. If I recall, it stopped there for several seconds (20 seconds?) when I first did it. I could not cancel out of this, and the receiver was locked up. I rebooted. Then I tried again. It locked up again. After about 15 minutes, I called DTV. The first representative told me that the AM21 was not compatible with the HR34. I directed her to the on-line manual on DTV's web-site, and had her look at page 4, where it says: "Note: The following DIRECTV® Receiver models are compatible with the USB Off-Air Tuner: DIRECTV Plus® HD DVR (models HR21 and above, DIRECTV Plus® DVR (R22 model only), DIRECTV® HD (models H21 and above) or DIRECTV® Home Media Center." She them put me on hold when she went to check on something. After about 20 minutes, I hung up and called back. Naturally, I got a different person - someone who had a bit more common sense. He told me the same thing that the AM21 is not compatible with the HR34. We went back to the web page once again... He had me reset once more - I physically unplugged both units for one minute, and connected them back. After the reboot, I was able to confirm that I still had my original off-air channels, and could pull the signal strengths; however, an attempt to do the initial setup resulted in another lock-up. I was wondering if this latest software update had any issue with the AM21's functionality. He said that he would open something for this to be investigated. Has anyone else experienced any issues? Thoughts?