Although I did experience the Polygon-Drop at the edge of the screen, the clipping problem I mentioned seemed more to do with distance. Here are some screen-shots to try and demontrate the problem:-
http://myweb.tiscali.co.uk/buckie/shot1.jpg
What you are mainly looking at is the two towers (any similarites to movies or events is purely coincidental) at either side of the main building, you can see the stairwells and torches through the walls.
http://myweb.tiscali.co.uk/buckie/shot2.jpg
Still looking towards the same building but further back, you can just about see the left tower in view, but the main building and the right tower are lost in the...fog...very dense fog!
I assume the "fog", as I call it (you may call it "draw distance"), is intentional to preserve processing power. All I'm really pointing out is the geometry being seen through walls.
If you still want the Map I'll upload it and PM the link to you as it was a group project and I don't have permission from the other group members to publicly distribute it! (I will ask them however)
Cheers,
Fox