all i can say is what i saw. on my receiver, i went into the place where you download movies and stuff. i set up 'torchwood' to download a number of episodes in HD. this takes a while on my DSL so i planned to watch them the next day. went looking for them under 'my rentals' and they were not there. tried it a few more times, but still no luck.
a few days later i was messing around with my revue and i noticed, under movies and tv, there were a whole bunch of torchwoods listed as being on my receiver.
The problem with the recordings disapearing was corrected with L750 on my 722k. Even the recordings that were missing before L750, reappeared after L750 dowloaded.