Page Rank disappeared - or a PR update?

[trinorthlighting]

I just noticed one of our old websites page rank disappeared for all the pages. Have not made any big changes recently, site still ranks well for all the search terms. I think it's a bug myself on Google's end. Is this happening to anyone else out there or is there a Page Rank update happening?

[trakkerguy]

Hmnn, seems an isolated case. Just did a quick check on 150 of mine and not a single change...

[trinorthlighting]

I thought it might be a fluke. I looked at webmaster tools and everything is showing fine.

[trinorthlighting]

We had a PR and huge backlink update this week. All of our sites are seeing some change for the positive.