I noticed that the Guide displays a static time status, so if you watch the Guide for an extended period, or select a channel to watch LiveTV from the Guide then return to the Guide, the Guide status is out-of-date. I then have to drop back to the main menu and then go back into the Guide to refresh the current time in the Guide. There have been a few instances where I have selected the left-most programme simply to start watching that channel but the Guide rejects the request due to the programme has already past.
It would be great if the Guide could dynamically update its current time (dynamic sliding grid like WMC).