Nice, thank you! This was the one problem that came up for me after the update. I could NOT get it to go to sleep. Big problem, as I couldn't confidently put it in my pocket until it went to sleep.
I had Spare Parts on my phone before the update, and thought that it might be causing the problem as the End Button Behavior says it's for 1.5 only. So I tried switching what I was using (press once for Home, then sleep) to OFF. But this didn't fix it. So I uninstalled Spare Parts, and this didn't fix it either.
But I just reinstalled Spare Parts and switched it to 'Go to Sleep' and now it finally works again. Choosing 'Home, then Sleep' does not work, which may have been my problem. Wish it did work, though, as this was handy. But I'll be OK with just having the default functionality back.
Hope this helps someone else.