Erica Ogg:

For the past month, some Mac OS X users have been reporting their personal data missing after logging into their guest accounts, and Apple now says it’s working on finding a fix.

“We are aware of the issue, which occurs only in extremely rare cases, and we are working on a fix,” an Apple representative said in a prepared statement Monday.

Some users are reporting that after logging out of the Guest account in Snow Leopard, which usually wipes the data from the Guest account’s home folder, they find  other users’ home folders wiped as well.

Although this bug may be rare, it is still a nasty one. I would suggest disabling the Guest account until Apple issues a fix.

Update 10/17/09: Jonny Evans, of 9 to 5 Mac reports that Mac OS X 10.6.2 beta fixes the Guest account data loss bug. It’s difficult to tell when the update will get pushed to regular users but Jonny Evans thinks it will be released very soon.