Structure elements not being set in CF9

For those of you running Coldfusion 9, if you could try a simple test for me.  Create a cfm page with the following code:

<cfscript>
      addressCriteria = structNew();
      StructInsert(addressCriteria,"personId",54392);
      StructInsert(addressCriteria,"addressType","Work");
</cfscript>

<cfdump var="#addressCriteria#">

Try running it, what do you see?  You might have to try changing the personId name to something else, like "test" and reload the page.

What's happening to me, is most of the time the personId element is blank, nothing in it.  I've tried the structinsert as well as direct assignment with the same result.  If I add a third element, that seems to fix the problem.  If a couple of folks could try this and see if they get the same thing or not, that would be great.

Thanks,

Jim