SAS in always working to improve. Changes in output or defaults may reflect requests, check the SASWare Ballot section of this forum for example or perhaps for better results with some other changed default.
If you post your original code it may help to see what might generate closer to the same results. Of course, if you previously ran the code on a 32bit system you may get minor differences than running with a 64bit system and/or operating system.
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