When I try to open up the User Accounts applet (either by using the icon in System Settings or by searching for it, it does not load. When doing it via System Settings the window locks up. When trying to search for it nothing appears to happen. I have tried rebooting and reinstalling User Accounts but the issue persists.
EDIT: I found out that it does eventually load, only after a long delay (greater than a few minutes but less than 4 hours).