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Mar 13, 2015 7:00 PM in response to AAT97by Gordon Grotts,I use Logic Pro 9 on both a 2012 13"Macbook Pro and a 2011 I-7 iMac. both with Yosemite, and have not had any problems with it. I do not think the problem you are having is the mix of Yosemite and LP9.