One bug that annoys me since I upgraded to Snow Leopard: After waking my computer from sleep the screensaver login dialog doesn’t accept my password. At the beginning it happened just occasional but today it won’t get accepted at all. I have to use the credentials of my second admin account to log back in (which feels a little weird …).
I’m going to do a little debugging. I hope I’m getting around a clean reinstallation.
Update: It seems that the uninstallation of Crashplan (which I never used and was still installed after the upgrade to 10.6) fixed my problem. I still get the kerberos-error in my logs sometimes, but I was always able to log back in.