Access Violation on nmz_get_field_data

Hello.

I have installed namazu (the Win32 binary distribution version 2.0.10) 
and setup properly.  Documents have been indexed, and I can search and 
get results using the namazu commandline program.
My intention is to write some C++ code using namazu, and I have been 
partially successful.  I created a simple Visual C++ application for 
testing, which does the following when a button is pressed:
        nmz_add_index("C:\\namazu\\index");

        NmzResult result = nmz_search("Some query");

        for (int i = 0; i < result.num; i++)
        {
                nmz_data current_hit = result.data[i];
                char title[512] = "";
                nmz_get_field_data(current_hit.idxid, current_hit.docid, 
"title", title);
        }

... and it works, sometimes.  When I click the button the first time, I 
can search sucessfully and retrieve the title of the documents for all 
results.  When I clicked the button for a second time, the nmz_search 
call succeeded, and I received a good NmzResult (correct num).  However, 
when the first call to nmz_get_field_data is made, some memory 
corruption occurrs: a bunch of variables (including the this pointer) 
are set to 0, which leads to an eventual crash.
I tried adding the nmz_free_hlist(result) and nmz_free_idxnames() calls 
at the end of the function, but the behaviour is still the same.
Any help would be greatly appreciated.  I am running Windows 2000 with 
Visual C++ 6.0 SP5.
        -Carlos