Toolbar PR and actual PR are two different things and update at different times.
SERPs and PR are two different things as well.
Usually if there is no information available on your site, your site has lost its entire PR, even zero.
Could be a glitch with the site you're using though or even an update with the datacenters.
Really though, PR isn't anything to lose sleep over. Forget about that and concentrate on your SERPs.
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