Same problem here. Driving me crazy. I've tried every combination I can think of to get my phone to do what it used to do before JB. I use my phone in my car a lot so I dont use a lock screen. However, the other times I'm not in my car and the screen times out when I am reading an article or something and I press the home button it wakes the screen up and goes back to home screen. If I unlink the "default action" in nova prime, it will not let my home button take me to the home page when on other tabs. Frustrating. I wish there was an easy fix to this. I mean I have had 4-5 droids and never had a problem with this when I just used "no lock".