ROS3D.Viewer not appearing

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With our custom package, I used to be able to show ROS3D.Viewer object on Chrome last year but now I can't. So what can cause ROS3D.Viewer to not appear in general? Sorry for sounding elementary; I'm still new to web app dev and I can't even think of what info I should provide, without advices from experts.

Live demos on http://robotwebtools.org/demos.html seem to be working for me, so my environment should be configured fine for RWT to work properly.

Environment:

• Ubuntu 12.04. FF32.0, Chromium 37.0.2062.94
• OSX 10.9.5 37.0.2062.122

If someone wants to run, there's a readme but the package is still under development and the way it installs is hacky for now.

It used to look like this:

Now. ROS3D.Viewer pane is not shown: