Sorry this is a couple days old. I’m a bit behind from all my travels….
It seems like Google implemented a feature (which is transparent to searchers) but really messes up tools that are used to run ranking reports.
WebPosition Gold, as well as other ranking report tools (scraper based tools - including the SEO Firefox plugin) have been impacted.
Some are predicting the end of reporting on Google rankings is near!
Current Update: People are reporting that some programs when used with their API are still working. Others are having no luck. Seems to be a little in flux right now. Having the API is your best chance but even that may stop working. We’ll see!