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We did build and test most OS X machines on 10.10.5. We'll try on the newest tonight for you =) Can we ask what machine you're one?

I'm running on the following specs:

Mac Pro (end 2013)
3,5 GHz 6-Core Intel Xeon E5
32 GB 1866 MHz DDR3 ECC
AMD FirePro D500 3072 MB

Hope this helps :)