Description of problem:
Normally when you enter bad password, gnome-screensaver displays msg "Incorrect password" for a short time and then "reset" the prompt dialog. (i.e.,msg about wrong passwd disappears). 
The problem occurs when there is some pam msg displayed on passwd prompt and you enter bad passwd. The msg "Incorrect password" is not displayed and prompt doesn't reset itself properly, i.e. the pam msg which should be displayed on prompt gets cleared. 

Version-Release number of selected component (if applicable):
gnome-screensaver-2.16.1-8.el5_6.3

How reproducible:
100%

Steps to Reproduce:
1. add "auth optional pam_echo.so file=/tmp/somefilewithashortmessageinit" to the top of /etc/pam.d/system-auth
2. Activate Lock screen
3. Try to unlock screen with bad password
  
Actual results:
The msg "Incorrect password" is not displayed, pam message from Step 1 gets cleared.

Expected results:
Prompt shows briefly msg "Incorrect password" and then pam message from Step 1 is displayed again.