For now, here’s a version of the plugin with a fix for the problem. We’ll try to get a new release out soon.
http://kriss.cx/tom/elsewhere/Syphon%20QC%20garbage-collection-friendly.zip
Are you planning to distribute the finished app? If so, you’ll have to include and load a version of the plugin and be able to handle conflicts with any installed version users may already have – which is a whole other kettle of fish…