I have a Mac Pro with multiple displays in a somewhat unusual arrangement:
I’m finding that the right-click context menus in the Projucer will flash momentarily and then disappear if the main window overlaps any of the following areas (red):
Just a minor annoyance - not worth focusing any significant energy on it - but thought it was worth mentioning.
OS X 10.11.6
Projucer 4.2.3 (from juce.com zip)
Mac Pro 4,1
Mixed GFX vendors (all vanilla Apple cards)