When taking a single-window screenshot (using the alt-PrtSc shortcut), the mouse pointer in the resulting image is in the wrong location.
To create the attached image, I positioned the mouse pointer at the center of the large smiley face, at roughly the center of my 1024x768 screen. The actual mouse pointer does NOT move; just the image is affected.
I suspect gnome-screenshot confuses the coordinates of the mouse within the focused window with the coordinates relative to the root window. Some experiments that seem to confirm this:
If the focused window is at the top left of the screen (below the top panel), the incorrect mouse position is slightly above the real mouse position, by a distance similar to the height of the panel.)
If the focused window is at the bottom left, the incorrect mouse position is substantially above the actual mouse position (corresponding approximately to the distance between the top of the window and the top of the screen.)
A similar effect occurs if the window is not flush with the left side of the screen (ie, if the window is in the center of the screen, the pointer will be translated both up and to the left). The pointer may be "cut off" (image showing the partial pointer or no pointer at all) if the window is moved far enough to the right or bottom.
Thank you for taking the time to report this bug and helping to make Ubuntu better, but unfortunately I've been unable to duplicate this issue. The Ubuntu developers will need to know which version of Ubuntu you are trying this out on. I can not duplicate this issue on Ubuntu 8.10. Actually, I can't get the screen shot to take a picture of the mouse cursor at all.