Unlock password dialog blank on resume

[drink]

Upon resume, the password dialog did not draw its contents and did not work typing blindly.
This is not identical to other bug reports because in this case the rectangle for the window is drawn, but never gains any contents.
Screen photo attached.
Cannot install mainline or saucy on this machine; mainline won't dkms nvidia and saucy install chokes at the first dialog. So I won't do that as a troubleshooting step at this point, because of ubuntu bugs.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: gnome-screensaver 3.6.1-0ubuntu3
ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
Uname: Linux 3.8.0-29-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Sun Sep 1 05:09:45 2013
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GsettingsGnomeSession:
 org.gnome.desktop.session idle-delay uint32 600
 org.gnome.desktop.session session-name 'ubuntu'
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 SHELL=/bin/bash
SourcePackage: gnome-screensaver
UpgradeStatus: Upgraded to raring on 2013-04-22 (131 days ago)