Hate to toss out a new PHP script so quick, but Yahoo shut down their existing API a couple days ago. If you are using an old version of the advanced usage script, you aren't going to get any updates for Yahoo. I updated the script to use a different Yahoo API that is not depreciated. The drawback is the new API isn't quite as functional (most notably we lose the ability to track Yahoo links). I suspect that has to do with Yahoo shutting down their Site Explorer. Anyway... rank tracking for Yahoo works again if you upgrade the PHP script.