Hi - I have the most aggravating problem. On my RHEL 5.2 w/s using gnome (or KDE), if you select "lock screen" from the pulldown and then try to unlock the screen with your password you logged in successfully with in the first place, it comes back shaking it's head INCORRECT PASSWORD. I did some digging and the /var/log/secure file is spitting out:

gnome-screensaver-dialog: pam_unix(gnome-screensaver:auth): authentication failure; logname= uid=500 euid=500 tty=0.0 ruser= rhost= user=username

Then below that also:

gnome-screensaver-dialog: pam_unix(gnome-screensaver:auth): auth could not identify password for [username]

I find this is happening on a few of my other RHEL systems too: RHEL 5.5, 6.0, and 6.5.

Help!

How are you getting back in to look at the logs? Do you have to restart each time?

Yes, each time is a reboot since this machine is a standalone. Before I test something that will maybe fix it, I set a "sleep 60; init 6" and then do the screenlock. If I am unsuccessful at getting back in, then I know of course it will reboot in 60 seconds. ugh what a pain....