The first miss may be a result of guide changes made when the Viacom channels were turned off. There have been several other guide issues because of that.
The second miss, especially since there is nothing in history, is puzzling. If you're not seeing the 7/25 showing in your guide data you may want to flush your guide cache and let it rebuild. You can do that rebooting, via the info & setup menu, twice in a 30 minute time period. This will discard the guide data you have and re-acquire fresh data. It will take 24 to 48 hours though before you have complete guide data and posters again.
The second miss, especially since there is nothing in history, is puzzling. If you're not seeing the 7/25 showing in your guide data you may want to flush your guide cache and let it rebuild. You can do that rebooting, via the info & setup menu, twice in a 30 minute time period. This will discard the guide data you have and re-acquire fresh data. It will take 24 to 48 hours though before you have complete guide data and posters again.