Much code depends on it being actually started, even if only just before closing the plugin.
I don't know if this really fixes the problem, but it definitely makes our testcases crash less often
Google Streetview regression
Adds support for symbol class tags that are derived from classes defined in an external SWF. For example http://edition.cnn.com/video/ needs this. The root script does stop() and starts loading an external SWF. When the external file has been loaded and parsed, nextFrame() is called. The symbol class can not be bound before the initialization of the second frame because only at that point the base class definition has been loaded from the external file.
Cairo will be thread safe in the version in quantal