can't unlock screen locker

[Tomas Brandysky]

Since I've upgraded to 13.04 I am sometimes not able to unlock the screen locker which doesn't respond to <ENTER> and thus even doesn't check the provided password.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: kscreensaver 4:4.10.3-0ubuntu0.1~ubuntu13.04
ProcVersionSignature: Ubuntu 3.8.0-25.37-generic 3.8.13
Uname: Linux 3.8.0-25-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: amd64
Date: Sun Jun 16 12:26:07 2013
InstallationDate: Installed on 2011-12-23 (540 days ago)
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MarkForUpload: True
SourcePackage: kdeartwork
UpgradeStatus: Upgraded to raring on 2013-04-26 (51 days ago)

[Ulrich Lichtenegger (ulilicht)]

can confirm this, but cannot reproduce it. It happens in maybe 40% when i select "lock screen" from kMenu and in maybe 30% when i suspend my computer.