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Yeah that's pretty odd then. I assumed it was your rank trackers since we had a similar issue once with ours and it was just an option un-ticked. I have been looking at some of our clients sites rankings today and we're not having the same thing, plus I would assume that it's not something happening to many people, such a change would mean all forums, blogs, etc... with be filled with people asking the same question and wondering what's going on. If that's the case, it means it's just this particular site. What browser did you use to check manually? It's just that with Chrome it doesn't matter if you're logged in or not, it will still give you some level of personalized results some of the time (which is stupid I know), and to make matters worse, I found FF to be returning completely different results to both Chrome and IE for a few searches yesterday. Maybe it would be worth checking in a couple of different browsers. If it's still the same then I hate to say it but you've got two options... 1) Wait it out for a couple of days in case it's just one of those weird things that do seem to happen, and/or... 2) Start thinking about what changes were made with the site recently to have caused it. I doubt that's at all helpful as I'm sure you already thought of that but like you said, it is bizarre... bizarre Google stuff seems to be happening a lot lately! Have you got points left to ask in private Q&A? That's probably your best bet since then you'll get one of the SEOmoz staff answering and if they don't know, no-one will.

Google actually specifically told SEOMoz to not include their pagerank in the Mozbar.  Luckily there is a way to add pagerank! Download a 3rd party toolbar that has pagerank.  I use the quirk searchbar: http://www.quirk.biz/searchstatus/ You can then take as many or as few fields as you want, I use pagerank and alexa, and move them into your mozbar! Go to options: General: Location and you can set where you want the quirk bar to show up.