DMOZ pages given PR0 by Google

I understand that this is not an issue of concern to most ODP editors, but I am surprised by the following observation. All pages below this one

http://dmoz.org/Arts/Visual_Arts/Painting/Painters/Oils/

show up as PR0 in the Google PageRank classification. Does anyone have any idea what could be causing this? Why would Google dislike oil painters in particular? <img src="/images/icons/confused.gif" alt="" />

Revisit them now. The little green bars are back. It was probably a glitch (or is that glich?)

Still PR0 on my toolbar (different result depending upon where your toolbar gets its information??).
I don't think that it is a temporary glitch, since it was like that before, and still is now after the latest Google update.

Hit reload a few times, or try it from a different browser. All the directory pages below that link have PageRank.

msaw: I've noticed small problems with the Google Toolbar PR display myself recently - a couple of days this week it has been entirely blank, but then "resumed" and on some sites it was displaying PR values but not on other sites.

Since Google is just coming to the end of a "Google Dance" it could be temporarily hiccups. If you still experience strange problems in week's time, it may be worth contacting Google Inc themselves.