http://www.engadget.com/2009/10/12/snow-leopard-guest-account-bug-deleting-user-files-terrorizin/
Think your Snow Leopard woes are finally over? Don't go logging into that
Guest account, then. A flurry of reports have surfaced around the web
explaining that even an accidental login to one's Guest account within Snow
Leopard could lead to mass deletion of all user files on the primary account
, and when we say "mass deletion," we mean "mass deletion." The problem goes
something like this: if one