Bug#762266: "(null)" gets displayed instead of date on screen unlocking dialog

[Nachanon Vetjasit]

Package: mate-screensaver
Version: 1.8.0-5~bpo70+1
Severity: normal

Dear Maintainer,

I've installed MATE Desktop from Debian backports repository,
the desktop worked as expected. When I selected main MATE menu
and selected "Lock Screen", screen goes black as expected.
But as I moved mouse, the screen unlock dialog appeared
with this content:

                22:39:40
                 (null)

            Nachanon Vetjasit
           window on WINDOW-NB

   Password: [                   ] en

[Leave Message][Switch User][Cancel][Unlock]


The second line on dialog should be current system date.
But instead, it displayed as "(null)".

Screenshot of this dialog is also attached.

Regards,
Nachanon Vetjasit


-- System Information:
Debian Release: 7.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 3.2.0-4-686-pae (SMP w/4 CPU cores)
Locale: LANG=th_TH, LC_CTYPE=th_TH (charmap=TIS-620)
Shell: /bin/sh linked to /bin/dash

Versions of packages mate-screensaver depends on:
ii  dbus-x11                  1.6.8-1
ii  libatk1.0-0               2.4.0-2
ii  libc6                     2.13-38+deb7u1
ii  libcairo2                 1.12.2-3
ii  libdbus-1-3               1.6.8-1+deb7u3
ii  libdbus-glib-1-2          0.100.2-1
ii  libfontconfig1            2.9.0-7.1
ii  libfreetype6              2.4.9-1.1
ii  libgdk-pixbuf2.0-0        2.26.1-1
ii  libgl1-mesa-glx [libgl1]  8.0.5-4+deb7u2
ii  libglib2.0-0              2.33.12+really2.32.4-5
ii  libgtk2.0-0               2.24.10-2
ii  libice6                   2:1.0.8-2
ii  libmate-desktop-2-17      1.8.1+dfsg1-1~bpo70+1
ii  libmate-menu2             1.8.0-4~bpo70+1
ii  libmatekbd4               1.8.0-2~bpo70+1
ii  libnotify4                0.7.5-1
ii  libpam0g                  1.1.3-7.1
ii  libpango1.0-0             1.30.0-1
ii  libsm6                    2:1.2.1-2
ii  libstartup-notification0  0.12-1
ii  libsystemd-login0         44-11+deb7u4
ii  libx11-6                  2:1.5.0-1+deb7u1
ii  libxext6                  2:1.3.1-2+deb7u1
ii  libxklavier16             5.2.1-1
ii  libxss1                   1:1.2.2-1
ii  libxxf86vm1               1:1.1.2-1+deb7u1
ii  mate-screensaver-common   1.8.0-5~bpo70+1
ii  mate-session-manager      1.8.1-4~bpo70+2

Versions of packages mate-screensaver recommends:
ii  mate-power-manager  1.8.0+dfsg1-2~bpo70+1

Versions of packages mate-screensaver suggests:
pn  rss-glx            <none>
ii  xscreensaver-data  5.15-3

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