So glad the developer released a version that's compatible with Snow Leopard. I've used it for almost 3 years; I run it after I download a few big software updates. I've personally never had any problems running it in Tiger, Leopard, or even Snow Leopard. I often do clean-up utilities one after the other--checking for permissions problems is my last step. And I have not had permissions problems from running this app. Only APPLE updates have ever given me that problem.