Thanks, I've reuploaded the archives with the updated terrain.
The updated version is 2012-06-28. I've changed the version number belatedly. If you have 2012-06-27, to find out whether you have to redownload, look at the directory images/proxima/spheres/. If it has 2 files, download the current version, if it has 14 files, your -06-27 is identical to -06-28.
-- Simon