Just downloaded the Basic Version of WP Google Maps .. and went through the steps. Problem I am having is the marker location settings are correct and preview of map showing marker is fine (in WordPress Plugin Dashboard settings). But when I preview the actual webpage .. map location display is correct but the marker is not displaying.
Thank you so much for getting back to me on this one.
I had a look at your site and it appears your theme (or perhaps another plugin) is loading the Google Maps API on the site. This causes a conflict as we also load the Google Maps API by default.
Please have a look at the following documentation for a guide on resolving these conflicts: http://www.wpgmaps.com/documentation/troubleshooting/how-to-solve-the-maps-api-loading-more-than-once-on-a-site/
Alternatively, I could assist you with these changes as well?