According to multiple topics on the Apple Support discussion boards, the problem can occur when a user logs into their Mac's Guest account -- whether by accident or on purpose -- and then tries to log back into their regular account.
In some cases, users have reported finding their regular account empty of data, as though it were a brand new account.
Speculation is that something makes Snow Leopard treat the regular account like a Guest account, from which by default all data is deleted upon logout. Further speculation is that the problem occurs when the Guest account was already enabled in Leopard before being upgraded to Snow Leopard.
The problem started being reported within days after Snow Leopard's shipping, but the discussions are all still marked "not answered"
The only solution for getting the deleted data back is to restore it from a backup.
An article on MacFixIt suggests disabling the Guest account entirely, or at least disabling it and then re-enabling it so that it's a native Snow Leopard account. Another suggestion for those who need a temporary account is to create a new Standard account and use Parental Controls to restrict it.
A bug has been reported in Apple's new Snow Leopard version of OS X that can result in the loss of an entire user account's data. The glitch seems to be triggered by using a Guest account and then trying to log back into a regular account.
FREE NETWORKING SERVICES CASE STUDYAs one of the world’s largest social networking services, Facebook handles a lot of user information, and requires input from an astounding range of stakeholders 24 hours a day, 7 days a week — from both inside and outside the business.
Discover how Facebook was helped to connect remote employees, vendors, consultants, and partners to applications and web services quickly and reliably - without risking sensitive data.
GET THE IT BUDGET YOU WANTExplore your Network Treasure Trove to get the IT Budget you want
With Australian businesses projected to spend over $78.7 Billion why does it feel like you can never get the budget you need?.
In most cases your budget will get approved because the proposals are not only technically correct, but also provide good, credible evidence on how the spend aligns with key business objectives.
Did you know that your Network Monitoring tool can help you build a comprehensive business case without an MBA?
HERE ARE 8 TIPS TO GET THE IT BUDGET YOU WANT.