**System Information**
Operating system and graphics card
Mac OS X 10.9.5, NVIDIA GeForce GT 750M
**Blender Version**
Broken: (example: 2.69.7 4b206af, see splash screen)
Worked: (optional)
2.72b
**Short description of error**
Clicking the Preferences window banner red circle on a Mac closes the entire application instead of closing just the Preferences window. The only way to hide (but not close) the window is click anywhere outside the window, but then it automatically redisplays each time Blender is restarted.
**Exact steps for others to reproduce the error**
Based on a (as simple as possible) attached .blend file with minimum amount of steps
Choose "User Preferences" from the File menu, then click that window's red Close button on the window banner. Instead of closing the preferences window, the entire damned application shuts down.