Two weeks ago, we reported that users using Yahoo! Site Explorer were seeing different results depending on whether they were logged in or not.
The Yahoo! Search Team has answered the call in a recent blog post, saying that a product fix was released:
While the counts have been incorrect in some cases, the actual returned results have been correct. However, we did roll out a product fix yesterday and will be rolling out a couple more over the next few days to resolve this difference in counts some of you have observed.
Thank you, Yahoo, for reading the Search Engine Roundtable. ;)
Forum discussion continues at WebmasterWorld.