Thinking of upgrading your Mac to ‘Snow Leopard?’ At just $29 to upgrade from OS X 10.5, the answer to that is probably “yes” if you own an Apple machine. Generally speaking, early reviews have shown that the operating system is a worthy upgrade, and while it’s certainly nothing revolutionary, it does offer up enough new functionality to justify the small asking price.But not all is peachy in the world of Snow Leopard. Early testers have discovered a strange quirk within the OS that casts some doubt on just