Incredible....
I had not been as of late since I had read that both Google and Yahoo's API's were not the most accurate way of doing things. I was thinking of trying with them in place to see if that makes a difference. Also, I am thinking of extending the amount of time between searches which is a setting within AWR.

An interesting link on the subject which I can neither confirm nor deny is below. According to them, Google has been cracking down on SERP software since July 2007.

Google Blocks SERP Tracker for Bad Behavior - Sitening Blog - Nashville SEO (Search Engine Optimization) and Web Design