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I'm using a WordPress plugin which allows me to participate in Google Site Generator & I don't see it having any problems crawling my site.
A friend has just written me to say that unless your individual posts are well-linked to by external sites your PR is not going to be very high. And I don't think many of my individual posts are widely linked in that way so that prob. explains the '0' ranking for most individual post pgs.
If your main page has PR6 and is linking to them, then the inner pages should have a decent PR. Perhaps the toolbar just hasn't been updated with their PR yet?
I'm not quite sure how to check if my main pg. is linking to the inner pgs. But I do have a most recent post list plus monthly archives ea. on main pg. so these do link to inner pgs.
Also not sure what you mean by the toolbar not updating. Can you get it to update & determine whether or not it is updating?