font-viewer freezes

[corne]

https://bugs.launchpad.net/ubuntu/+source/gnome-font-viewer/+bug/1425786

Installing a font, if we open the font in font viewer and press the install button, the system will become unresponsive on successful install. cannot open terminal for xkill, nor does any force close warning come up. The only way to get control is to ctrl+alt+f1 into commandline and sudo reboot the system.
(also reported here for ubuntu: https://bugs.launchpad.net/ubuntu/+source/gnome-font-viewer/+bug/1425786)

At 2nd try only font-viewer freezed, so I could use xkill effectively.

font with the problem : droidSans.ttf (no problems with OpenSans-Light.ttf)
downloaded from: http://zagortenay333.deviantart.com/art/Conky-eOS-402533520

My system information:
Elementary OS 0.3.1 Freya
linux 4.1.0 kernel