Not completely sure if it is related to flashing the open-mode kernel, but I was trying to set the lock-code - my N9 is flashed with open-mode kernel - and I just get an error 'wrong lock code' when trying to set a lock code (no lock code is set previously)
I started a question for this in this thread, so if anyine knows, please answer

http://talk.maemo.org/showthread.php...63#post1167363