I am having a similar issue. I have three DVR's... Bedroom, office and living room. The office has the most recordings on it. From the living room and bedroom I can see a full playlist... Bedroom and living room can stream between each other just fine, as well as if your in the office selecting a recording on the bedroom and living room. However when your in the living room or bedroom and select a recording from the office dvr I get the packet error. Watching the recordings in the office work fine.. I have rebooted via red buttons all three DVR's. The receivers are connected via deca modules... Living room is an hr 24 with the cinema kit.
Huh, this is almost exactly the same problem I just had. I have three HR-24s (Living room, bed room, and office). The bed room unit seems to be the problem -- it can play recordings from any of the three boxes, but the living room and office couldn't play recordings from the bed room (got the error message from the thread title). The living room and office could, however, play recordings from each other and themselves.
I did a reboot from the settings menu on the bed room unit, and that fixed it (for now).
The same problem happened 3 weeks ago, just before I was leaving town for Christmas. I think all I did to "fix" it that time was go to the bed room and watch a recording from the living room, and afterwards the living room was able to play bed room recordings. However, I was in a rush and might be misremembering -- I might've rebooted the bed room that time as well.