I'm running Gimp 2.6.8 on a Snow Leopard (1.6.2) MacBook and don't have a Menu Bar at Toolbox Window. My X11 is the Apple provided version (2.3.4) .
The image bellow is the screenshot of Mac Menubar, Toolbox Window and a New Image Window.
I don't know if it is important, but I have previously installed multiple versions of Gimp and my machine was originally a leopard (10.5.x) box.
Any clue on how to fix it?