Hard to put this into words, but my wife noticed recently that while watching a program and backing out to the grid guide (by hitting menu) the currently watched channel is no longer highlighted.
For example, if we’re watching the news on channel 704 at 7pm and hit menu, I’m returned to the guide, but a different channel at a future time is highlighted (in this case it’s PBS at 11pm).
It throws off your sense of “location” within the guide. Not sure when you guys introduced the fast scrolling (with the vertical bar on the right), but my guess is that it has something to do with that.