can't click on warning window, window not active

http://askubuntu.com/questions/477228/cant-click-on-warning-window-window-not-active

When I want to connect to a network using a certificate, and I don't provide one, the network manager will open the window "No Certificate Authority certificate chosen", with the buttons "Ignore" and "Choose a CA certificate". I would like to "Ignore", but I can't click on the popped-up window. The window below ("Authentication required by Wi-Fi network") remains active, and I can click anything there, e.g., "Cancel".

Pressing the tab-key doesn't to anything, and the alt+tab list just contains one entity "Network".

Consequence: I cannot connect to the network.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: network-manager 0.9.8.8-0ubuntu7
ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
Uname: Linux 3.13.0-27-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Jun 5 17:05:27 2014
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2013-11-15 (202 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
IpRoute:
 default via 192.168.43.1 dev eth1 proto static
 192.168.43.0/24 dev eth1 proto kernel scope link src 192.168.43.14 metric 9
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to trusty on 2014-04-17 (48 days ago)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 eth1 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/1
 eth0 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
 running 0.9.8.8 connected enabled enabled enabled enabled enabled