I am a new user of Overture's Content Match XML feed and their Yahoo Search XML feed for publishing sponsored content on a website. My technical team is discovering a high rate of failure on requests submitted through these feeds (approx 10% of all requests either return no results or don't return). We are also discovering erratic coverage where a request on the Yahoo Search feed will sometimes return some sponsored links and sometimes return no sponsored links. In discussions with Overture's technical staff we are told that there is nothing wrong with the feed and that it must be our implementation. I am wondering if anyone else is experiencing these problems.