First off, great plugin.
When I initially started using the paid version of the plugin I had a few problems and thought it was a dud. After 30 minutes of playing around I found 3 solutions to the most common problems in the support forum - problems I also had.
1, if u have a short code for a map that does not exist anymore on your site (a map that was deleted at some point), all other maps will not work! Delete that bad boy!
2, The plugin did not allow me to display the same map in multiple spaces on the same page (ex, footer widget + main content area). By making multiple maps for the same page, many of my problems were resolved.
3, After purchasing the developer version I had issues with a map I created using the free version of the plugin. Fixed another issue by creating a new map in the developer version.
Good luck everyone. With a little tinkering I am positie 99% of your issues will be resolved. I didn't have to use code or make any modification to the plugin or my site.