I used to have PR2 and now it is N/A. Also any thumbnails of my site are now blank. Does anyone know why this would be? www.linkinparkmania.uni.cc
Some users reported the same thing. It's something related to the upcoming PR update. You can't do much at this point, just wait and see what happen.
Do not worry if your not doing anything wrong. Wait it out and see how site does. Worry more about where site is listed for keywords not PR.
PR does not have any pull anymore. Keep an eye on it it should rebound... if not check your backlinks to see if any are link farms, that could be another reason for the drop.
me too.. may be G doesn't give too many attention any more to PR or PR will not for public purpose anymore or they just slow