Mac MonoDevelop Preventing Shutdown

I am using Unity 4.3.2 on OS X 10.9 and have an annoying problem that MonoDevelop always prevents my Mac from shutting down—even after there have been no changes. Right clicking on MonoDevelop in the dock and selecting ‘quit’ also seems to be a bit hit-or-miss if it works.

Is there a reason for this and a workaround?

Others share your frustration:

I couldn’t get the menu or right clicking in the dock to work for me, BUT, if you use the shortcut “command+Q” while Monodevelop is open, is works for me every time to close the program.