gzclient Segfault Breaking Gazebo User Interface

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Hello Community,

I am having trouble with my Gazebo user interface. When I first boot my computer, Gazebo works fine, and will load a blank map when I ask it to. However, if I ever restart Gazebo for any reason (close out and start again, etc.), the user interface glitches out. Instead of seeing a gridded map as usual, the gazebo screen appears black. I can still insert models and delete models and edit the environment, I just can't see what I'm doing.

When I run dmesg in the terminal, I get this line that I suspect is the root of the problem:

[  605.908616] gzclient[2329]: segfault at 4 ip b6adada9 sp bff9b8a0 error 4 in libQtGui.so.4.8.1[b64d9000+aaa000]

EDIT:

I tried logging out and logging back into my user, then running gazebo, and got this error:

Gazebo multi-robot simulator, version 1.9.5
Copyright (C) 2014 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

Gazebo multi-robot simulator, version 1.9.5
Copyright (C) 2014 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

Msg Waiting for master.Msg Waiting for master
Msg Connected to gazebo master @ http://127.0.0.1:11345
Msg Publicized address: 134.197.42.190

Msg Connected to gazebo master @ http://127.0.0.1:11345
Msg Publicized address: 134.197.42.190
X Error of failed request:  BadDrawable (invalid Pixmap or Window parameter)
  Major opcode of failed request:  137 (DRI2)
  Minor opcode of failed request:  3 (DRI2CreateDrawable)
  Resource id in failed request:  0x3400002
  Serial number of failed request:  28
  Current serial number in output stream:  30
gzclient: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = gazebo::transport::Connection]: Assertion `px != 0' failed.

Can anyone tell me what the problem is and how to fix it, or at least give me some leads on how to solve this?

Thanks, skyguyjedi