• (1) On exit from most plug-ins, the plug in destroys the parent window (COWPump), which makes COWPump exit.
• (1) GL Plug-ins that go to full-screen sometimes crash when exiting.  I believe this is because the plug-in starts several threads that get killed on exit, but BEFORE the CVisRender thread stops rendering... so when the render() call is made, the plug-in crashes.