[texworks] Latest LaTeX downloads break XY Pic on iMac

Tom Reinhardt tomr7 at verizon.net
Fri Apr 15 11:10:12 CEST 2011

Running on an iMac, software version 10.6.7, running the latest relevant updates from the TeX libraries, etc., I see that LaTeX no longer parses XY Pic diagrams that require under/over
arrows correctly:

For example 
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should be produced by 
\xymatrix{A\ar@<0.5ex>[r]^{g}\ar@<-0.5ex>[r]_{h} & B\ar[r]^{f} &C}.

This works in LaTeXIT, as the diagram above shows, but does not work in TexWorks or in TeXShop?

Any suggestions?


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