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One of the most important things you can do in a situation like this is to separate the number that the toolbar reports (which can sometimes be buggy and is never in real time) from the reality of your actual Google traffic. You can save yourself a lot of fruitless worry.
How does your traffic look right now? Did it fall off or is it stable? If it is stable, I'd say don't worry about the toolbar PR one bit.
For more information about PR, and why the toolbar report may not be very important, see:
Google PR - PageRank FAQs [webmasterworld.com]
[edited by: tedster at 5:44 pm (utc) on June 24, 2007]
If you apply a bit of common sense you would see that it wouldnt be in Google's interests to drop a site because it was unavailable for a short time.
Did you check the PR on a couple of different dc's? Do you still have links to your home page?
Sometimes the toolbar acts a bit strange on my Mac / Firefox, too.