Wired is reporting that an update to the DirecTV D10 receiver is causing problems for TiVo and ReplayTV owners. Apparently it's not always accepting commands sent over the serial port, causing some missed shows. The solution listed is to use the IR blaster, which can have the same problem as the one reported.
The conspiratorially minded think that this update is just an effort on DirecTV's part to get them to buy receivers with PVRs built in. A DirecTV representative responds "I can absolutely say this is not a tactic to get people to switch over to another receiver," which is just the sort of thing you'd expect them to say if there were a conspiracy.