Currently Being ModeratedFeb 1, 2014 3:28 PM (in response to scrmngfist)
I have upgraded just yesterday night to Mavericks, going directly from ML 10.8.5 directly to 10.9.1.
I am experiencing exactly the same behaviour that is decribed in the arstechnica forum and it has happened with Mail, Chrome, Safari and the Console window. I am also seeing those log messages.
I have a Late-2009 iMac.