Mark,
I’ve fought this issue for about 3 days this week. The issue really is caused by the image files — when you click the checkbox to import the attachments. If you don’t select this prior to import, all your blogs will import perfectly.
I kept trying import the posts with the attachments and had “remote sever errors each time.” Well, I found this post: http://en.forums.wordpress.com/topic/transferring-wordpresscom-to-wordpressorg-1?replies=3#post-358009
I kept thinking I needed to import the attachments so all the blog images would be hosted in my new ww.wp.xz.cn install. But, after reading the post above, and doing a 1 post import, I confirmed that the URL link the images in the post points BACK to the orignal wordpress.com blog. This actually works fine; all you need to do is keep your original blog.
If you do want all the images in your new media library, you have to go in an update the links for every single image.
I hope this helps …
