Maperver and IIS question

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I have been using Mapserver on IIS 5 for some time now.  I have set up and
am running Windows 2003 and IIS 6.  I copied my demo over there for
testing.  It is a modified Itasca demo that is the basis for my app.  I
have the following problem.

I load the default page and press intialize.  The map shows up as
expected.  I see the main map, my key map and my user interface controls
like pan and zoom in, zoom out, layer controls, etc.  Nothing else works
beyond this point.

Any command I choose, such as zoom, has no effect.  The refresh query
button does nothing.  There are no messages of any sort that are
generated.  The window just keeps displaying the map.  Any ideas where I
could be going wrong?  Other things I could try to see what is happening
under the hood?

I think permissions are all OK and I have my bin directory on the system
path.  Mapserver is working because I get the map.

Thanks