Default lock screen no longer works

I recently reset (factory) my phone (Droid Incr2), and reloaded all my apps. I'm trying out the new GoLocker, although I can't really see any benefits over the standard locking mechanism, which is no longer working. Yes, Virginia, it is enabled in both the default settings as well as GoLocker's settings. It only works on power up. None of the default locking mechanisms ... password, pin, pattern ... work (except at power on.) I would really like to LOCK my phone when not in use. It doesn't work regardless of the default desktop (HTC Sense) or if I use GoLauncher (which I prefer). What did I miss?

Karen