Hello,
I had the same problem as you! My configurations are:
lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04 Codename: trusty
lspci -k | egrep 'VGA|3D' -A2
00:02.0 VGA compatible controller:
Intel Corporation Broadwell-U
Integrated Graphics (rev 09)
Subsystem: Dell Device 0643 Kernel
driver in use: i915
After some research, I found this link which suggest to upgrade the kernel and graphical stack with the command:
sudo apt-get install --install-recommends linux-generic-lts-utopic xserver-xorg-lts-utopic libqt5gui5 libgles1-mesa-lts-utopic libgles2-mesa-lts-utopic libgl1-mesa-glx-lts-utopic libgl1-mesa-glx-lts-utopic:i386 libglapi-mesa-lts-utopic:i386 libegl1-mesa-drivers-lts-utopic
Gazebo started to "work" again, as you can see:
I hope this answer can be helpfull.
Best regards
Please, run by terminal with the command gazebo --verbose and feedback with the output.