I have upgraded to Snow Leopard and immediately Boinc stopped working. Uninstalled all data related to Boinc and installed it again two times. Same result each time, will not work and locks up. When they get this fixed I will install it again. Until then sorry, but I cannot use it. The download does not even list Leopard let alone Snow Leopard. If they want Mac people to help with these projects they need to update the program. Until then, I will do nothing else, as there is nothing I can do. They are welcome to use my computer for this worthwhile project but I will not worry about it any longer. I do not need this program and they are the ones that have to make it work, not me.