[BUG] Corrupt document display on Macbook

On a fairly new Macbook (purchased in December 2007), I find that  
documents displayed in Amaya have blocks of pixels displaced or  
duplicated, apparently in a random fashion.  I attach a screenshot  
showing the Amaya welcome page thus corrupted.  The screenshot is of  
version 10.0, but the problem also afflicted 9.55.  I have not  
observed a similar problem in any other application.

Andrew Runnalls
University of Kent