Hi Nic,
Thanks for the update, I've been looking through the forum today and found some posts that might have some relevance to this post.
First of all a post about flickering on the z2670: http://communities.intel.com/message/198575#19857
Secondly is there any difference in setup between our (mostly) N2600/2800 and the D2700 you are using? I think not but maybe that could be affecting some of your diagnostic work.
Thirdly I believe that the current drivers are using Imagination technologies 1.7 DDK, is it possible and are there any potential advantages to use the later (latest?) version 1.9?
Thanks again,
Alasdair