No... sounds like your PR was corrected and you will have to wait until the next update comes to see if it increases.
Relax. This happened to me before. I had a site with PR7 and it went to PR2 and I had no idea what was going on. Then, I checked out all the links that "I" was linking out to and found one that was banned by google. Since "I" was still linking to that website, google penalized me. So go through all the links that you have on your site which you link to, and see if any got banned. Remove the ones that got banned, and you should move up again in a few days or a week.
Google is really screwing up lately, hopefully the engineers there get it together and get it all fixed soon, because alot of good sites are being punished for no good reason this month
Dropping of page rank number is normal. It may be a result of getting a bunch of crap links. If the problem is in your page rank tool, try to use google toolbar, it is accurate and correct!
On multiple data center checking, your site has PR0 http://livepr.raketforskning.com/?u=http://www.yowallpapers.com/
Two main reasons for PR drop: 1) You had too many outgoing links (PR leak) 2) Your back links are no longer there.
Your sig still looks like your happy lol -- Quit worrying about a number that defines your site. Content is king!