[plt-scheme] cdr: expects argument of type <pair>; given #f

I just downloaded and installed the full Windows Installation 359.200.  
When I search on anything in the help desk, I get a list of appropriate 
choices.  But when I click on one of them, I'm sent to a screen that 
tells me:

The file you were looking for was not found on the Help Desk server.

_Help Desk Home
_
Powered by PLT

When I then click on _Help Desk Home_ I get a dialog box which gives the 
error message:

cdr: expects argument of type <pair>; given #f

Has anyone seen this before?  I checked all my directory settings, and 
they all appear to be in order.  There were no installation problems, 
and all my plt packages and planet requires have been reinstalled 
without a hitch.  But I have no Help Desk.

Thanks,

--kyle
airfoil at bellsouth.net
http://schemekeys.blogspot.com/