Yosemite seems to have this bug with Juce based audio plugins (vst´s) , see https://www.ableton.com/en/help/article/yosemite-compatibilty/ , theres a pic here http://s7.postimg.org/7xq68otij/bug.png , if there is anyone out there using el capitan and that are aware of this and can say something, if el capitan resolve this issue or not i would be thankfull (its not a big issue since seems to happen only with 32 bit plugins but..)