I’m running 3.0.16 now after rolling back and it works fine now. You have to deactivate (not delete!) the plugin and use FTP to copy over a rolled back version of the plugin.
This is definitely a bug. I had my WPEngine team look into this and they couldn’t find a single thing that to fix this error even going so far as to put my live site into a staging area, disabling all the plugins, changing the theme, and making sure the permissions were all correct. The problem persists.
