Snow Leopard users have reported that they've lost all their personal data when they've logged into a "Guest" account after upgrading from Leopard, according to messages on Apple's support forum.
The bug, users said in a well-read thread on Apple's support forum, resets all settings on the Mac, resets all applications' settings and erases the contents of critical folders containing documents, photos and music.
The MacFixIt site first reported the problem more than a month ago.
Users claimed that they lost data when they'd logged into their Macs using a "Guest" account, either purposefully or by accident. Reports of the bug go back to Sept. 3, just six days after Apple launched Snow Leopard, or Mac OS X 10.6. Users who said they'd encountered the bug said that they had upgraded their systems from Mac OS X 10.5, known as Leopard.More...