Gimp 2.6 just came out. It is an improvement over 2.4 but bugs still need to be fixed.
Anyways, run the following to remove Wilber (the fox) where the toolbox menubar used to be:
echo "(toolbox-wilber no)" >> ~/.gimp-2.6/gimprc
in the command line.
The creators don’t like this, but the image is a waste of space.