From Wang Rui, "I've fixed the bug of writing/reading scenes including the ImageSequence serializer. Current trunk version will fail when handing image sequences because it forces to set className to "osg::Image" in InputStream.cpp. I have to read a value saved in file instead so I must add a hardhanded version checking for backward compatibility.

Now we can work with ImageSequence objects, in both osgt and osgb files."