MacBook Air, MacOS 10.12.6, 1.7 GHz Intel Core i7, 8GB RAM.
Broken: Blender 2.79b (installed May 4, 2018)
Short description of error
The existing “Do you really want to quit?” feature doesn’t work for “Open…” nor for “Open Recent…”
Exact steps for others to reproduce the error
Move the default cube.
Do “File | Open…” or “File | Open Recent…” and open another file.
PROBLEM: There is no warning that you have unsaved changes.