Using the Grab utility, my captured screenshots are sometimes missing objects and text that were clearly visible in the original image(*). I understand this is because some of the graphics have been generated via hardware acceleration and those bits aren't retrievable.
Is there any way to turn off graphics hardware acceleration on the MBP?
(*) The latest case was an image of Jupiter with its moon, Io, hovering in the foreground, generated with Celestia. The output from Grab shows Jupiter, but Io is completely absent as is the text overlay that is present in the original.