I get a fatal error on the page which should show our map. This is the message:
Fatal error: Call to undefined method marker_groupsModelGmp::getMarkersGroupsByIds()
Hi, @E W Keesmaat
Please, try to remove your free and pro (if you have it) versions of plugin from your website, then download the latest ones and install them again.
You can contact us via internal support to receive archives with latest versions of plugin.