I have found that if you leave the channel parked on Aux1 over night and then try and view the guide right after it it will attempt to download the guide but will not finish. 1) Leave your 811 on and tuned to Aux1 overnight. 2) In the morning, Press the Guide button 3) Move 24 hours in advance. This should result in an attemp to download guide. After it seems to download the guide info. 4) PRess guide again. You will see that it will try to attempt a guide download again. 5) THis process repeats with the guide never successfully downloading. I tried this two nights in a row and it did repeat. I will try this with OTA tonight to see if it is just the fact that an SD input is not being used.