Go to this page, type in your URL, and look at the results. You’ll see multiple Google data centers, and each data center will show the PR of the URL you typed in. A few of the data centers (including the “toolbar” data center) may have your old PR listed instead of your current PR. Your current PR should be reflected by the majority of the data centers (i.e. only a few of the data centers should be showing your “old” PR).