I was running 2.8.4 with an older version of Domain Mapping, and everything worked fine with 2 blog/sites.
I moved one website from a Plone setup to my WPMU and was finally ready to just point the real domain. So I updated the A record, added it to my server DNS, and then added the domain to my site. I must have typed in the domaincom vs. domain.com, so I couldn't remember how to edit this and decided I should see if there was an upgrade to the plugin (I did search my database for a table, but didn't find it until today (duh, page 2!)). Anyhow, so I updated the plugin but that broke my two other already working domain maps. All I see on the user side is a reloading the page (which is just blank). After reviewing the plugin, I realized it needed 2.8.6, so I updated the core files. Still get the same problem.
I do have the domain map pointing to my IP and each blog has the real domain as the primary domain.
Here are a few of the sites:
http://bellaverdura.com
http://bellazucca.com
Oddly, in admin, the URL works just fine - i.e.
http://bellaverdura.com/wp-admin/tools.php?page=domainmapping takes me to the domain mapping settings....
If I set the domain to the blog url (http://bellaverdura.galfanodesign.com), then that site still works just fine...
None of these are currently checked:
Permanent redirect. (better for your blogger's pagerank)
Redirect administration pages to original blog's domain
Help?