Hi, I have a forum and it used to have a PR2 and today I visited the site and it's a 0...any ideas? Thanks.
Yes, I have an idea. If you were reading this value from the toolbar there's a chance the toolbar hasn't been updated yet OR is still in the process of being updated from the last PR export. I wouldn't worry too much.
That, or it's banned. Do you still get visitors to that forum from google? If so, you have nothing at all to worry about. The toolbar PR is by definition old and outdated. Your number of visitors through google changing is a more relevant metric - and very up to date as well.
There has been a Google PR Update, perhaps Google no longer see any value in the majority of the links pointing to the website? Don't forget that PR data is about 3 - 6 months old when we get to see it. Get more links
I won't worry too much though, since PR is meaningless anyway. I saw somewhere that a banned site gets a grey PR bar in the Google bar. Can anyone confirm?
Check your site on a few data centers. Try http://livepr.raketforskning.com I would not worry about your PR going down as long as you are still getting traffic and ranking for the terms you want don't worry