That bug has been opened on https://launchpad.net/distros/ubuntu/+source/gimp/+bug/34264

"To replicate this do the following:

Open anything, web browser is what I had running.

Open the GIMP.

File->Acquire->Screenshot->

Grab "a Single Window", making sure gimp is still on top/in focus.

click 'grab', now look at where gimp was in the picture, and you'll see it's all distorted.

This error, in my opinion, definitely needs to be fixed before release.

Screen shot appended, below are my versions:

:~$ dpkg -l |grep -i gimp
ii cupsys-driver-gimpprint 4.3.99+cvs20051122.dfsg.1-2ubuntu1 printer drivers for CUPS
ii foomatic-db-gimp-print 4.3.99+cvs20051122.dfsg.1-2ubuntu1 linuxprinting.org printer support - database
ii gimp 2.2.10-1ubuntu2 The GNU Image Manipulation Program
ii gimp-data 2.2.10-1ubuntu2 Data files for The GIMP
ii gimp-python 2.2.10-1ubuntu2 Python support and plugins for The GIMP
ii ijsgimpprint 4.3.99+cvs20051122.dfsg.1-2ubuntu1 printer drivers for CUPS
ii libgimp2.0 2.2.10-1ubuntu2 Libraries necessary to Run the GIMP
ii libgimpprint1 4.2.7-10 The Gimp-Print printer driver library
ii libgtk1.2 1.2.10-18 The GIMP Toolkit set of widgets for X
ii libgtk2-perl 1.101-1 Perl interface to the 2.x series of the Gimp

and just in case it's necessary:

ii xserver-xorg 7.0.0-0ubuntu17 the X.Org X server

http://librarian.launchpad.net/1684721/badgimp.png
title says it all... :p"