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I was having a look at [un.org...] The website has a Page rank of 9.
However, it was surprising to see that some of the following internal pages that have been linked directly from the home page have a page rank of 0.
The very fact that these have been linked from the homepage (with Pagerank 9) should have led to at least some pagerank in the above internal pages.
Will appreciate some views on this.
Some inner pages, btw, do show TBPR
Those pages have not been affected by the recent change in URL structure. The General Assembly section has been located at /ga/ for over ten years. They may still be in the process of making these changes throughout the site, as there seem to be some irregularities. For example, I would expect the English version of General Assembly to be located at /en/ga/, instead of /ga/, and the French version of that same section is located at /french/ga/, instead of /fr/ga/.
However, it seems pretty evident that the page rank is not showing up due to the 301 redirect from the old dir structure to the new one.
I had a similar experience while working with a large ecard site some years back. During that time Google was not well equipped in handling canonicalization issues at it is now. So we had 301 redirected the non www urls to www. A couple of weeks later we found all the internal pages of the site going down to a pr of 0. It took around 2-3 months before the PR was reinstated in all the internal pages.