physics::Model::SetScale() only works sometimes

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I have a ModelPlugin that scales models by calling physics::Model::SetScale(). It works consistently in one project that I'm working on but not in the other. In the other project, it almost never works. One time after I rebooted, it worked for about an hour.

I have followed my scales through the code to World.cc line 2666: this->dataPtr->modelPub->Publish(msg); Everything appears to behave correctly up to that point. I haven't figured out what happens to the message after that.

Does anyone know what might be the problem? I found one other claim of SetScale() not working: http://answers.gazebosim.org/question...