Cannot login with lightdm/frozen cursor in password text box

[Jens Herrmann]

My default loginmanager was gdm until the upgrade to Xubuntu 14.04. which changed the default to lightdm. Since I often get stuck at the login screen when booting my laptop. I can see the text box for the password and can also see the cursor (static - not blinking) but cannot type anything in it. I am always able to move the mouse pointer, the menus at the top right do work sometimes, sometimes they don't. There were some cases where everything worked after waiting for 1 minute, but more often I am stuck and pull the plug at this point.
I now use gdm again, but can do further testing if required.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.10.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: XFCE
Date: Sat Apr 26 12:15:10 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-11-26 (150 days ago)
InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
LightdmConfig:
 [SeatDefaults]
 greeter-session=lightdm-gtk-greeter
 user-session=xubuntu
SourcePackage: lightdm
UpgradeStatus: Upgraded to trusty on 2014-04-22 (4 days ago)