Does that mean you guys don't use the remote shortcut buttons? I find them really useful and use them all the time to navigate around the system.
Also what if the last screen you had been in wasn't Guide? If you'd been looking at say the Videos/TV Shows/Schedule etc page before then going back to Live TV, the back up button would take you back to that screen not the guide so you cant reliably use backup to get into the Guide. Not relevant to sorting the bug, but I'm amazed that I appear to be in the minority in making use of them.