Seems to work for me. Although I'm just glancing at the issue. Right now I'm trying to keep the board moving along, and not dieing, it's been running like molasses since I upgraded it. It's always something.
Try again, cause maybe it had to do with the slowness of the board, and I think I might have identified, and de-installed the offending software that's been slowing us down.
Also, where do you go, what specifically happens when you hit the back button. Plus, if you hit it twice in a row, does it then work?