open gnome-terminal minimizes immediately when selected

[Removed by request]

The system runs trusty with gnome-shell. Intermittently, the running gnome-terminal can not be activated anymore - neither from dash, nor from alt-tab - the window minimizes immediately. Applying Alt-F2 'r' recovers from the symptom.
***
gnome-terminal:
  Installiert: 3.6.2-0ubuntu1
  Installationskandidat: 3.6.2-0ubuntu1
  Versionstabelle:
 *** 3.6.2-0ubuntu1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status
***
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04
***

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-terminal 3.6.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2
Uname: Linux 3.13.0-8-generic x86_64
ApportVersion: 2.13.2-0ubuntu4
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Feb 19 10:40:34 2014
EcryptfsInUse: Yes
SourcePackage: gnome-terminal
UpgradeStatus: Upgraded to trusty on 2013-12-20 (60 days ago)

[Removed by request (stoni.ch-deactivatedaccount)]

Hello, this problem seems to have vanished since it didn't appear again on any of our systems for many weeks. Regards, dsto