If you’re having stupid amounts of trouble with your plugins loading in Safari4 on Snow Leopard, go to your Finderand open /Applications. Right-click on the Safari app and choose “Get Info.” On that screen, you’ll see a checkboxto run the app in 32-bit mode. Check that. Restart Safari if it’s open. Now you’ll find that your plugins magically work. I guess this whole 64-bit thing has caught developers with their pants down.