So, within less than a week my blog PR came back. Not a clue why Google PR4 got dropped to nothing, but I am happy it came back to normal. So, this is for anyone out there with PR drops, just wait a few days, maybe it was just a fluke.
I also noticed a change in the WordPress admin interface, I wonder if that has anything to do with that; I guess I will never know.
Please take this poll and let see how many of us had the same problem.