After several days of troubleshooting, and reading MANY helpful posts in the domain mapping forum, I've finally configured our server and the plugin correctly it seems! YAY!
However, we are running into one issue I have not seen addressed here.
Our network makes use of heavy customization on the wordpress/buddypress Admin bar (buddybar, whatever you wanna call it). It interlinks many of our sites and we want it to be present on ALL subdomains.
However, now that domain mapping is working correctly, it appears that all of the domains that are using the mapping plugin do NOT display the Admin Bar.
Has anyone ran into this problem or know of a fix?