Yup. mine got hit with it too.
I was trying to go a few hours out to record the west coast feed of the olympics in SD mushyvision since my Charmed/IronChef/Desperate Housewives/L Word Sunday bloc was prohibiting an Olympic timer from the NYC feed. (grr, where's my 622 E*?,). No dice it said "No Information" past 2 hours from now).
I rebooted and the guide data came back, but only out 2 days. Overnight, the full guide came back, but I'll keep an eye out. The 921 has been real flaky the last two weeks with a bunch of missed timers, early firings (which fail to notice that two OTHER timers are scheduled during those times and are causing a conflict).
I don't know WHAT you E* guys are doing, but KNOCK IT OFF. These things are flaky enough as it is......