UTF8_CONVERSION_ERROR_NEGATIVE failure

[Gross, Tim (Utility Computing Architect)]

Hello,
When I do a curl_easy_perform(), it always fails.  

    res = curl_easy_perform(m_curl);

    if(res != CURLE_OK)
    {
        printf("Detailed CURL error: %s\n",sDetailedErrorInfo);
    }

Sometimes this prints out UTF8_CONVERSION_ERROR_NEGATIVE and sometimes it has 
garbage characters in it.  Has anybody seen this before?

Tim.