NOTE: The dropdown says 'multi-domains', but this is for the domain-mapping plugin. Its not installed at the moment as it locks me out of my site, so it's not available as a choice in the dropdown.
Not sure what I might have done wrong, but I'm having some sort of problem with Domain Mapping. I have a multisite installation of WordPress. I'm running both the Domain Mapping & Multi-Domain plugins on my site, and found myself unable to log in. Every time I tried, I ended back up at the login page.
After removing the Domain Mapping plugin, I was again able to log in.
Once logged in, if I replace the plugin, I have no issues with navigation at all. I've checked settings, used the sunrise.php file from the Domain Mapping plugin, and altered all of the code in the config file to match instructions.
I should note that it does not affect the front side of the site. Visitors can still navigate the website, they just can't log in.
During trouble-shooting, at one point I removed EVERY plugin except for Domain Mapping, and it still locked me out, so I'm not even sure its a plugin conflict. Maybe something I did wrong with my config file?