N7/4.2 Can't add lock screen widgets? I was pretty excited to hear Android 4.2 brings lock screen widgets. But after updating my Nexus 7 tablet, I'm not able to do that: I just have a clock widget that I can remove (it reappears after sleep/wake), but I can't add any widgets in any way. At first I was able to swipe right and I got a "+" where I presumably could add them, but now that's gone.

Could it be because I have a corporate (i.e. exchange) account configured and because that forces me to have a password? Or is it some glitch? I have tried rebooting it.
I have the same issue, N7 with 4.2 with an Exchange Corporate Account that forces a password/pin.

You are correct that it has to do with corporate account.  I removed my corporate account and was able to add widgets, even with the security still set to "password to unlock".  I also changed to Pin and Slide to unlock and all of them worked as well.

I then re-added my corporate account and the widgets that I added were gone and I was unable to add any others.

That said it's not a huge issue for me as the only Widgets I had the option of adding were Clock, Gmail Inbox, and Calendar.  Clock is already there and I don't want my Email/Calendar displayed without unlocking the tablet.