I'm on OSX 10.9.5 (Mavericks) and having trouble opening the Projucer, I have the same probelem as here: http://www.juce.com/forum/topic/crash-mavericks-1095
// Projucer is not supported on Mavericks.
I wonder what the best OSX and Xcode is at the moment to work with JUCE?
Yosemite or El Capitan