How button is the tutorial. Not sure why GrindCraft deleted. It saves as a "sharedObject" which is flash's version of a cookie. My guess is that it is getting flushed by security settings, or flash is unable to save. Right-click GrindCraft, choose "Settings" and make sure flash is allowed to save 10kb. Also right-click and select GlobalSettings to make sure flash is allowed to save there, too. Finally, go to this site and do the same: http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html
Nice tip! :)