Plugin Doesn’t Search or Post Maps

Good Day,

I work in the support area of a University and we run a WordPress installation for faculty and students. Recently we received a request for the WebMaps for WordPress plugin to help with some mapping faculty want to do.

We’ve installed the plugin and activated it, the Add Map button is available, and when we click on it we get a new screen that provides options to Search, insert a Map, create a Map (upgrade). Unfortunately, when we select any of these nothing happens.

I’ve tried to use the plugin on two different systems:
RHEL Linux 6 with Apache 2.4 and PHP 7.1. WordPress was latest version running a Multi-Network and Multi-site (subdirectories) installation. and the second system was a Mac running OS X Yosemite (10.5.5) with built in Apache 2 with PHP 5.5.38. WordPress is the latest version running multi-site (subdirectories).
both with the same results.

Please let me know if you have any suggestions about how to correct this.

Thanks
Dave