The FileChooser title is JUCE - app name. For my VST there is no app object so its only JUCE. The title I give is only displayed below. This is not very good, I want my file dialog to have a title like any other OS X app or Tracktion…In any case JUCE shouldn’t be there (it apears also in the JUCE demo app).
Also if I debug my VST using debug frameworks (as you can ask to do in XCode debug properties) I get many OS X debug asserts. I get some also for Tracktion (did you try it with debug frameworks?) but the file chooser gets much more