I installed the plugin, I then shared with every button, although I couldn't with Google+ as I'd already shared with that button for this particular article. The buttons seem to work, looking in Google Analytics for the real-time events, but not seeing them.
Also the Facebook Recommendation Bar part of the Facebook for WordPress plugin has gone red. I can't even read the error, but it appears it doesn't get along with this plugin.
I put my key for my blog in the settings, but not my developer ID, I'll have to dig that up too, or is that the Facebook FanPage Adminstrator ID, either way I left it blank... Maybe I'll try removing the key too.