Prnt Scrn Button Won't Take ScreenShot if Context-Menu is Active

In Ubuntu 12.10 (using the Unity desktop) you can typically perform a screenshot by pressing the "Print Screen" button on you keyboard. This launches gnome-screenshot, and you are given a dialog allowing you to save that screenshot to a file system location.

However, this does not work if you have activated a context-menu of an indicator/applet by the clock. I'm specifically trying to take a screenshot that showcases the contents of the network-manager's context menu for another bug ( https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1078662 ). However, while that context menu is displayed, the "Print Screen" button doesn't launch gnome-screenshot.

Another example would be if you wanted to take a screenshot of your desktop with the clock's calendar showcased. To reproduce:
1) Click on the clock (to display its calendar)
2) Hit the "Print Screen" button
3) Nothing happens ( gnome-screenshot is not launched as expected).

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: gnome-screenshot 3.6.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Wed Nov 14 20:03:29 2012
InstallationDate: Installed on 2012-10-19 (26 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-screenshot
UpgradeStatus: No upgrade log present (probably fresh install)