It seems as though support for this plugin has been dropped... the plugin stopped working after they made a week-long "server migration" and it's impossible to get in touch with them (the live chat feature on their website is never active, and they don't reply to messages to the only email address listed on their site).
I started getting a database connection error between my site and theirs (where the ads are stored and served from):
//FATAL ERROR: Connection to database server failed : 18.104.22.168:3306:tmp/mysql.sock
New banners don't display on my site, and when I control-click the broken image, I see the error above.
Anyone else experiencing a similar issue?