Robot That Worked in Gazebo 2 Fails to Launch in Gazebo 4

edit

Related to this question (http://answers.gazebosim.org/question...). I have a robot that previously worked in Gazebo 2 on a different computer that I've been trying to port over to Gazebo 4. For some reason, every time I try to click on the name of the model under the "Insert" tab, Gazebo just exits without any errors or warnings. It was not like this for some of my simpler models or the models that were provided by default in the Gazebo model database. I've checked over the .sdf and .config files but can't find anything wrong with it. I've attached the .sdf file below just in case anyone is interested.
model.sdf

Here is the code for the .config file:

<?xml version="1.0"?>
<model>
  <name>Mesh Robot</name>
  <version>1.0</version>
  <sdf version="1.5">model.sdf</sdf>
  <author>
    <name>John Doe</name>
    <email>john.doe@example.com</email>
  </author>
  <description>
    Insert description here.
  </description>
</model>

The only changes I made after downloading the files onto the computer with Gazebo 4 was that I changed <sdf> version tags from 1.4 to 1.5. The meshes referenced are saved exactly in the folder I wanted. I honesly have no clue what else to do at this point. Any help would be greatly appreciated, thanks.

UPDATE: When I ran Gazebo in verbose mode, I got the following warning.

[Wrn] [ColladaLoader.cc:1361] Polylist input semantic: 'COLOR' is currentlynot supported