The most immediate thing to do would to edit /Volumes/ChimeraInstaller 1/Chimera.app/Contents/Resources/share/Animate/SceneState.py and change line 1031 from "return false" to "return False" (leaving the indentation the same).  Sorry about the bug.

--Eric

                        Eric Pettersen

                        UCSF Computer Graphics Lab

                        http://www.cgl.ucsf.edu