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To make a long story short I am not seeing fluctuation with my sites right now -- they are keeping their ranking and placement currently.
Would the toolbar rank fluctuations explain a site that fell from PR6 to PR5 on the homepage (although it keeps flicking back and forth), while several important internal pages steadily maintain PR5? Would it be likely for these pages to rank as high as the home page when the update settles?
cutiger, the Toolbar sometimes shows the last URL you visited when you go to a brand new URL with no PageRank calculated yet.
If you're worried about the PageRank showing the last visited URL, then run a link: search on the URL you want to check. If it's shows backlinks then the PageRank is genuine, otherwise if the URL shows PR4 or more then it's probably false.