I get the "Poser not responding" message when I'm rendering a scene in Firefly. I've found that what I need to do before rendering is, close any Poser windows I don't need (specifically the Library), bring up Windows Task Manager and stop all the Chromium processes that are running - usually there are at least 5. I have no idea why there are that many going, but they are a HUGE drain of resources and kill Firefly rendering. Superfly rendering is not affected. I'm running Windows 7 Pro, 16Gb RAM, GeForce GTX 670.