PDF in a player object has resolution problem on a newer Mac

[David Epstein]

When I set the width and height of a player object displaying a PDF  
to 1.5 times its formattedWidth and formattedHeight, I get

-- exactly what I expect, a legible, scaled image, on my old PPC Mac  
Mini; but

-- very poor resolution on my newer MacBook Air.  (Resolution is fine  
if w and h are 100% of formattedWidth and formattedHeight, but not if  
I make it bigger).

Can anybody explain this difference, or suggest a remedy?  Thank you.

David Epstein