It's damn annoying, I've put myself in as an excluded user, but the definition of "after 0 minutes" has changed, it used to be that it never locked unless I pressed the power off, which is exactly what I wanted, now it locks after about 30 seconds in that mode, but at least I can change it to an hour if I'm driving so the GPS software doesn't get locked out.

I'll see if I can use one of our support tickets to log a call with Microsoft about this unless anybody has done it?