Version-Release number of selected component (if applicable):
kde-workspace-4.10.1-2.fc18.x86_64
polkit-kde-0.99.0-5.fc18.x86_64
polkit-qt-0.103.0-7.fc18.x86_64
polkit-0.107-4.fc18.x86_64
qt-4.8.4-14.fc18.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Log in as user1 (member of wheel, don't know if it is important)
2. Switch to a new session, log in as user2 (not a member of wheel)
3. Switch back to the first session
4. Try to suspend the computer
  
Actual results:
Polkit-kde asks for credentials but all keyboard and mouse input is being refused.
After 25 seconds the (user1's) lockscreen appears, allowing the input again. After unlocking the desktop, one can input his password again into the polkit-kde prompt which is still there.
Entering the correct password won't do anything, however. The desktop is suspended once the user has attempted to suspend the desktop once again (this time he doesn't have to input the password though).

Expected results:
Polkit-kde asks for credentials, allows input, suspends the computer if the credentials were right.

Additional info:
Both sessions mentioned were KDE Plasma Workspaces in a clean updated Fedora 18 installation.
I think this started to happen in 4.10 with the new screensaver but I'm not sure.