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Description of problem:
With the latest version of gnome-shell, I am unable to unlock previously locked screen. The login form on the lock screen is missing, the only thing I can see is a grey background and three icons in the upper right corner. 

Version-Release number of selected component (if applicable):
gnome-shell-3.8.4-2.el7.x86_64
gdm-3.8.4-2.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. login to gnome-shell desktop
2. lock the screen (e.g. using Ctrl+Alt+l)
3. try unlocking the screen (e.g. press Enter)

Actual results:
Login form is NOT displayed, therefore user is unable to get back to their desktop.

Expected results:
Login form is displayed and after entering correct password, user is able to see their desktop.

Additional info:

Works for me, with current composes. This may have been a side-effect of problems in logind in systemd 205, which have since been fixed.