Responsive Maps not, you know, Responsive

Hey all,

I'm using Google Maps and Events +, and can't seem to get my maps to function responsively. I've activated the add-on, checked Make These Maps Responsive for Auto-generated maps and All my maps, and they neither expand to fill the parent div, nor contract when I narrow the browser window.

Site: http://www.erdagardens.org/event-archive/2013/04/work-party/

I've had a number of conflicts between themes from this very competent developer (Organic Themes) and WMPU plugins, which leads me to believe it's something about their practices vs. WPMU's. (I'm using GMaps on another site, from Themoholics, without a problem.)

Any guidance?

Thanks so much!