Console message :
2013-01-17 22:27:35.083 ff[84480:903] *** <QCNodeManager | namespace = “com.apple.QuartzComposer” | 349 nodes>: Bundle at path “/Users/dam/Library/Graphics/Quartz Composer Patches/Syphon.plugin” is not a valid Graph Foundation plug-in
2013-01-17 22:27:35.118 ff[84480:903] *** QCPlugIn: There is already a QCPlugIn registered for class “SyphonServerQCPlugIn”
2013-01-17 22:27:35.121 ff[84480:903] *** QCPlugIn: There is already a QCPlugIn registered for class “SyphonClientQCPlugIn”
2013-01-17 22:27:35.121 ff[84480:903] *** QCPlugIn: There is already a QCPlugIn registered for class “SyphonServerListQCPlugIn”