"Getting remote endpoint failed." on OSX

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I've installed Gazebo 1.9.0 using the homebrew formula on OSX (10.8.4). I can run gzserver and then gzclient and use Gazebo with no problem. Running the "gazebo" executable however gives the following error:

hododav@Davids-MacBook-Air:~/Downloads∫ gazebo
Gazebo multi-robot simulator, version 1.9.1
Copyright (C) 2013 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

Gazebo multi-robot simulator, version 1.9.1
Copyright (C) 2013 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

Msg Waiting for masterError [Connection.cc:786] Getting remote endpoint failed
libc++abi.dylib: terminate called throwing an exception
Msg Waiting for master
Msg Connected to gazebo master @ http://127.0.0.1:11345
Msg Publicized address: 192.168.1.138
2013-08-27 08:12:29.303 gzserver[94557:707] invalid drawable

I also updated the formula to pull 1.9.1 and reinstalled and still get the same error. Any suggestions on what could be causing this or how to troubleshoot it?

Thanks,

David