Is your testing server local or is it on a live server?
If the testing server is on a live server you might want to download the google_javascript folder from your testing server to your local files in DW.
I got the source from your page and i was able to edit the map on your page, however i think you are using an older version of pro maps for google. I recommend that you install the latest version from your download center (1.0.6), and try reapplying the map to your page.