I recently installed Leopard, and I enabled the Guest account in System Preferences. Yesterday, I booted up my Macbook, and accidently logged in as Guest (instead of as myself). Instead of displaying the Guest's desktop, OS X seemed to crash, and, after a while, the Login-window reappeared. I then just logged in as myself, and everything seemed all right.
I worked for a couple of hours, and I wanted to log out, but I got the warning that I was logged in as a Guest and that all files in my home directory would be deleted. I was, however, not logged in as guest. I stupidly clicked ok, and logged out.
An hour or so later, I logged in again, only to discover that all my files were gone! That is: not only the guest account, but also the administrator account was completely wiped out!
Luckily I could use Time Machine to restore a backup quite easily, but I was quite scared!
I think this is a serious bug, and just wanted to let you know to take care when enabling the Guest account.
MacBook White, 2GHz Intel Core 2 Duo, 2GB RAM, 80GB HD, Mac OS X (10.5)
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