Same here. The weirdest part is that one of my sites that was down for over a month(had problems with hosting) and then I just put a page that says that the site will be backup soon for also over a month, and still it retained it's PR, while another site that was up and running all this time lost it's PR.
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Used Cars Gained +3pr in 2 months MY Business Blog Gained +3pr in 2 months And a load of my other projects got opening pr's of 3,4 and higher