[OS X TeX] A \url problem

[Vic Norton]

I am having a \url problem (with TeXShop/LaTeX) that is driving me  
crazy. Any advice would be greatly appreciated.

My problem can be illustrated with two parboxes, each containing the  
same URL.

\parbox{6.0in}{\url{
   http://vic.norton.name/finance-math/notionportf/pricedistrib.csv
}}

\parbox{5.0in}{\url{
   http://vic.norton.name/finance-math/notionportf/pricedistrib.csv
}}

The first parbox typesets the URL on one line. Clicking on this line  
opens a browser and displays the desired URL.

The second parbox typesets the URL on two lines:
    http://vic.norton.name/finance-math/notionportf/
    price_distrib.csv
Both lines are colored to indicate an active link, and the cursor  
changes to a pointing finger when it is over either line. However,  
when you hold the cursor over the first line, you see that it is  
pointing at the directory
    http://vic.norton.name/finance-math/notionportf/
which (on clicking the line) will not allow itself to be listed. The  
second line
    price_distrib.csv
points nowhere and goes nowhere, even though appears to be a link.

I can't figure out what the problem is here. There are broken URLs in  
my bibliography that work fine, but the 5-inch parbox one doesn't work  
at all.

Any advice would be greatly appreciated.

Regards,

Vic