Since the release of Mac OS X 10.6 (Snow Leopard), a number of users have reported that their personal data has gone missing after logging into their guest accounts. According to CNET, 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.

The statement marks the first time Apple has said it is looking into the issue. In early September, a handful of Mac users reported the issue on Apple’s discussion boards. The problem, when it occurs, goes like this: when logging into the guest account on their Mac first and then logging into their regular account, some users are finding all their data to be missing and their accounts completely reset.

This doesn’t appear to be a widespread problem and there are currently less than 100 posts on several current discussion threads on the issue. Microsoft is currently dealing with a massive data loss at its Danger subsidiary, the company it acquired that makes the Sidekick mobile phone.

Apple’s data loss issue marks the most recent significatn bug with the Mac OS X 10.6 operating system, including the Finder hanging or crashing, incompatibility with certain apps, and the AirPort connection dropping.

If you’ve seen this issue on your end, please let us know.