Just installed your plugin on our site and after playing with the free version a bit, I decided to upgrade to Pro. I don’t seem to be able to create or edit any location data on my maps now. When I make changes or try to save a new location, I just get Adding… for ever and the process hangs. My site is https://www.n1fd.org .
P.S. The problem seems to be related to the Pro upgrade add-on. When I delete the pro-upgrade add-on. The basic free version will again let me save positions on my map.