In OS X 10.11.6, with Xcode 7.3.1, the JUCE Demo Plugin from tip (either master or develop branch), crashes when loaded as VST3 (for example in Tracktion 7.1.1) when built with Address Sanitizer enabled (in Xcode’s edit scheme / Diagnostics).
The crash isn’t the same each time but it happens shortly after adding enough parameters in
initialiseMidiControllerMappings() to cause the
*parameters.params array to resize. Adding
parameters.init (10000); in
JuceVST3EditController's constructor works around it and causes the crash not to happen. That’s all I could find so far.
I got to this when enabling address sanitizer to catch sporadic crashes with my plugin in AU but ended up finding this instead…