I didn't have this problem until I connected my SquareShooter to the OTA input. I finally got around to buying a couple of diplexers this weekend just so I didn't have to run a second cable to the 811. This was just yesterday and as soon as I hooked up the OTA, the guide gave me the No Info problem.
The 811 was never a problem befor this.
After about an hour of scanning for digital OTA channels, getting incomplete guide info and having general lockups, I unplugged the unit for a few minutes.
On power-up, the 811 reset itself and finally scanned correctly for the digital OTA. I got the correct guide info and I can channel surf using the up/down buttons.
I have not had any more problems since but plan on checking it again this evening.