Google PageRank question

One of my clients, Powwownow, have recently launched their new designs for all their websites (UK, Germany, French and Dutch versions). Now the sites they had previously had received very good Google PageRank throughout. The UK website had a PageRank of 7, the German and French versions had a PageRank of 6.

We incorporated a 301-redirect when launching their new sites, which brought with it most of the "google juice". Unfortuantely some of their pages were brand new and didn't exsist in on the previous site. These pages currently have a Google PageRank of 0/10. Their sites is content managed and all pages have doc ids, some of the doc ids were transferred from the old site but some of them have new doc IDs, these pages also have a PageRank of 0/10 now. The client is understandably worried that this will affect their rankings. And they think it will take a long time before their new pages will receive the same PageRank as the old site. I personally don't think it will affect their rankings and consequently site traffic alot, the homepage still has a PageRank of 7/10. What do you think?

I would love to have some opinions about this, has anyone had any experience similar? How often is it believe that Google updates the PageRank?

Also, has anyone experienced that the Google toolbar gives different Google PageRank result depending on when you downloaded the toolbar? When i check PageRank on my home computer it gives a totally different result than on my computer at work? Has this something to do with the different data centers?