It is a bit confusing. The update to 10.4.8 is not enough. There is now a specific Daylight Saving update available at Software Update
Severin Crisp
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                   Assoc Professor R Severin Crisp, FIP, CPhys, FAIP
       15 Thomas St, Mount Clarence, Albany, 6330, Western Australia.
                    Phone  (08) 9842 1950   (Int'l +61 8 9842 1950)
                            email  mailto:[EMAIL PROTECTED]
                          Web pages http://www.JennyCrisp.com.au
                             & http://members.westnet.com.au/Crisp
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