as I stated before, Wifi dropped out on my twice last none. Hasn't happened today. I had a mysterious logout once It didn't wake from sleep properly once. I did an upgrade from a new install of 10.8.4. I might try to do a clean install, but I'll wait until Beta 2 I think since everything is working okay so far. I got Skype to work by using an older version. So something to keep in mind.