mouse battery notification close icon never disappears

When my wireless mouse is low on battery, gnome-shell (gnome-power-manager?) pops up a notification saying so. That notification stays up until i click on it, at which point it goes away, but the close bubble does not. see attached screenshot.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-shell 3.11.90-0ubuntu1~trusty1 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: GNOME
Date: Tue Mar 18 11:02:08 2014
DisplayManager: gdm
GsettingsChanges:
 b'org.gnome.desktop.interface' b'clock-show-seconds' b'true'
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
 b'org.gnome.desktop.interface' b'clock-format' b"'12h'"
 b'org.gnome.desktop.interface' b'text-scaling-factor' b'1.5000000000000004'
 b'org.gnome.desktop.interface' b'clock-show-date' b'true'
InstallationDate: Installed on 2014-02-24 (22 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140218)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)