This is something that happens from time to time, if you have done something wrong you should try to figure out what you did wrong and correct the problem.
It is a very big worry, because if you have a site that lost PR and you don't know why, even if the pr ever comes back some day, it will be in the back of my mind that there is still some small penalty in google's algorithm on my site........ ggrrrrrrrrrrrrr, this makes me just want to throw those sites and the years of work into them in the garbage and start over..... thanks alot Google
Yeap - it looks like Raketforskning is all jacked up - I can't get anything other than PR0 for ANY website!