what are the actual specs of the computer?
with ableton live, there has been problems with speed stepping functions (processor control, designed to conserve battery power and keep heat down by not running the processor at full continuously... ableton live tends to have artifacts occur before the processor steps up to full power).
this has only been with some dual processors on the macbook pros.
there is a program called coolbook
http://www.coolbook.se/CoolBook.html
which allows you to set your parameters manually, and alleviate the issue.
more info can be found on this in the ableton forum,
http://www.ableton.com/
it is well documented.
don't know if it has affected any other programs, though.