How do I make this window stop opening automatically?

Whenever I fire up the GIMP, a window titled "Layers, Channels, Paths, 
Undo | Brushes, Patterns, Gradients" opens automatically, and I don't 
want it to.  This started happening recently, although I have not [that 
I can recall] changed any of my preferences.  I've looked through all of 
the settings and cannot find anything that appears to refer to this 
window.  How do I make it stop opening?

I'm using 2.2.11 with GimpShop on Linux.