I wanted to upgrade my wordpress so I was upgrading my plugins first.
I have your plugin 0.5.2:
domain_mapping.php plugin placed in mu-plugins folder
sunrise.php in wp-content.
So I thougt I copy the version 0.5.4 over the existing one. I first copied the sunrise.php over the existing one and then copied the new domain_mapping.php over the existing one. But if I do that I get blank pages for my website and can't login to the admin. I put the orignal 0.5.4 version back and I can login.
How can I upgrade the plugin?