Safari 5.1.3 can't open Apple Support articles
I upgraded to Mac OS X 10.7.3, which includes Safari 5.1.3. Safari is working fine -- except it can't open any Apple Support articles. When I open the RSS feed for recent articles and click on a link to an article, the URL that shows up in the address field is, for example, http://support.apple.com/kb/HT5098?viewlocale=null&locale=null, when it should be http://support.apple.com/kb/HT5098?viewlocale=en_US&locale=en_US. Notice the incorrect null where the viewlocale and locale should be.
The URL shows up correctly in Firefox 10.0 and works.
Anything I can do to make it work right in Safari?
Mac Pro (Early 2009), Mac OS X (10.7.3)