Doesn't overwrite existing file - no dialog request

(Ignore the HUD anoyance.)
Make a screenshot with alt+print, name the screenshot 'test-1' and save it to a folder.
Make another screenshot with alt+print, same title and save it to the same folder.
There will be no dialog if you want to replace the existing file, it just closes after selecting the same folder.
Verify the image didn't get overwritten, it's still the first one, also the timestamp didn't change.

The procedure via terminal will display a dialog which is asking if you want to overwrite the existing file and it will in fact replace the file.
~$ gnome-screenshot -w -i --delay=5

** WARNING **: Unable to use GNOME Shell's builtin screenshot interface, resorting to fallback X11. Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Shell was not provided by any .service files

Output from .xsession-errors:
** WARNING **: Unable to use GNOME Shell's builtin screenshot interface, resorting to fallback X11. Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Shell was not provided by any .service files
ERROR 2012-02-26 01:44:38 unity.hud.view HudView.cpp:91 hud search bar lost keynav with no where else to keynav to
WARN 2012-02-26 01:44:39 unity.hud.hud Hud.cpp:183 Attempted to close the hud connection without starting it

Just in case it's important, these lines are repeated hundreds of times during a session, only the id number changes.
WARN 2012-02-26 01:45:06 unity.libdbusmenu-glib <unknown>:0 Generating properties error for: 2710
WARN 2012-02-26 01:45:06 unity.libdbusmenu-glib <unknown>:0 Error getting properties on a new menuitem: Error getting properties for ID

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-screenshot 3.3.2-0ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
ApportVersion: 1.93-0ubuntu2
Architecture: amd64
Date: Sun Feb 26 01:40:00 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120204)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-screenshot
UpgradeStatus: No upgrade log present (probably fresh install)