An easy to fix, but frustrating behavior my wife and I both experience: in theater view, while navigating through the grid of recorded shows tiles using the "right" direction button, we sometimes slip off the right hand end (last tile). The focus then goes to the menu above. My natural reaction is to just hit the "left" direction button to get back to the tiles. However, doing this then selects the "Back" menu item, which immediately (without any further key press) takes you out of the Shows list and up one menu level to the main menu.
I have fallen into this this twice in a row a couple of times just trying to select one particular show to watch. It's frustrating that the remote's direction keys do not produce symmetric results.
My suggestion would be that when in the grid of Shows tiles, the right/left direction keys move you within the Shows tiles only. If you want to get up to the menu, you have to press an up or down arrow key.