DirecTV had an unusual technical glitch sometime in the past 48 hours, and as a result customers with either standard or HD DVRs might experience issues with a "frozen remote" or similar behavior. DirecTV Has emailed customers to let them know (see below).

This is important because if your DVR is in the hung state they describe, you need to reset it, or your scheduled recordings will likely not be recorded.

I had the issue exactly as described the night before last on my HD-DVR, and did a red button reset (RBR) at that time in order to restore it to normal functionality, which is pretty much what the email from DirecTV says to do:

IMPORTANT NOTICE ABOUT YOUR HD DVR OR DVR RECEIVER

In our effort to improve and expand our service, we experienced a temporary technical glitch. If your HD DVR or DVR receiver is not responding to your remote control or front panel commands, you can resolve this issue by pressing the red "Reset" button located inside the small door on the front right corner of your receiver. Please allow about 15 minutes for your receiver to complete the resetting process. Once completed, your picture will return automatically. Unfortunately, any show you may have scheduled to record yesterday will not be available on your DVR.

We sincerely apologize for any inconvenience this may cause you. Our promise is to provide you with the best television experience, and to resolve any issues that might arise as quickly as possible. If you have any further concerns, please do not hesitate in contacting us at 1-800-347-3288.