What is the source of your signal?
I ran into something similar when trying to setup a Windows 8 Over the Air channel guide, one channel would not show any data. The Name of the channel also showed something like XXX temporary authority...... In Windows 7 on two computers the guide was completed.
I tried changing the Zip Code, resetting the TV card (Hauppauge HRV-2250), and installing another OS. Only Windows 8 had the problem. Perhaps other changes are being made to block certain channels.
So I don't really have any suggestions...Can you view the programming if you go to the channel in Media Center?