WordPress MU

I’m having trouble with inserting media into a Domain Mapped site, I think it has something to do with some of my blog options being incorrect.

Can someone tell me if these are the correct options for a domain mapped siite?

Domain: subdomain.domain.com
Siteurl: mapdomain.com
Home: http://mapdomain.com
Upload Path: wp-content/blogs.dir/21/files
Fileupload Url: http://mapdomain.com/files

The problem I am getting is a blank Media window after clicking "Insert Into Post". If I change the Domain option from subdomain.domain.com to mapdomain.com the image inserts however the URL to the image is still using subdomain.domain.com therefore I get a blank image.

Any help would be much apreciated,

thanks.

Known problem. There's no ideal fix to get it working other than what you described.

Images in posts you saved after Editing the Blog setting will not update by themselves.

How about new images? They still seem to be using the old subdomain.

I just came across some explanation and good discussion about the issue on this thread. http://mu.wordpress.org/forums/topic.php?id=9790&page=2&replies=43#post-62789

http://bui4ever.com/2008/10/problems-with-donnchas-domain-mapping-plugin/