Hi there. I have a problem I only just noticed, and may have been around for a while. At first I figured it was something obvious and stupid until I google'd for my error message and didn't find one single response.
When I run vipw (as root) after quitting and saving I get this:
vipw: can't unlock /etc/passwd: Operation not permitted (your changes are still in /etc/ptmp)
There are no ACLs enabled, and nothing appears in the logs.
I don't know for sure grsecurity caused this, however I just can't imagine what else would be causing permissions issues.