I've been using (3) QIP2500 STB's with a QIP7216 DVR for a year now. As of 06/25, when I attempt to watch a DVR'd show on any of the STB's, after I hit the final "OK", all I get is the info bar at the bottom of the TV screen with the DVR'd program channel and name, it does not start playing, then after a few seconds, the screen goes completely black, eventually reverting to the last menu of the DVR controls where I selected the recorded program. It's acting like there is a blank recording being sent from the DVR to the STB after the last "OK" is pressed, and the screen reverts to the last command prompt. If I try watching a recording from the DVR itself, all is normal, recorded programs can be watched, so the DVR is capable of playback, just not able to send a playback thru one of the STB's.
I unplugged one of the STB's overnight to see if a hard reboot would fix things. No change.
Have the code monkeys doing programming at Verizon issued a new release and effed-up the ability to play back thru STB's? I just checked the DVR, and I'm still on IMG1.8, contrary to all the notices that I get from Verizon that I can now add an eSATA drive to the DVR (requires IMG1.9, according to Verizon).