Shaddows - 10:56 pm on Feb 9, 2010 (gmt 0)
I know this might be a bit of a stretch but do you think that by disabling personalized search it could affect the rankings for websites that you are working on from that computer? I noticed that I went down for certain keywords that I was ranking for the day after I disabled personalized search.
I very much doubt it. What it might do is reverse the own-site bias that you had unintentionally signalled previously.