[OS X TeX] Typesetting plain TeX documents with /magnification gives odd results

[Benjamin Lotto]

Using TeXShop 2.02 under OS X 10.4.1 (Tiger) with TeX installed via i- 
Installer.

Typsetting plain TeX documents using \magnification=1200 (or anything  
else other than 1000) produces odd results regarding the placement of  
text on the page.  For example, the simple document

\magnification=1200
This is a test.
\bye

prints for me with the text line right up against the top of the page  
and the page number about 1.7 inches from the bottom of the page and  
shifted left.  It's almost as though the whole page has been shifted  
up and to the left.

If I go to the command line and do tex followed by dvips, everything  
works OK, so this looks like a pdftex problem.  The same issue crops  
up on other machines with similar setups.

Might I have something installed wrong, or be doing something else bad?

Thanks!

-Ben
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