Grafana GPAPhasorMap plugin seems not to work


I’m trying to make a dashboard in Grafana 7.5.0 using the GPAPhasorMap plugin to show my 10+ PMU on the map provided with the plugin. I have completed the longitude and latitude fields of each of my PMU devices in OpenHistorian Manager but nothing appears on the map : The map is displayed fine, but it is ‘empty’.
Here is the configuration of the plugin :


I have selected the ‘OHDATA’ source and no query (but also tried with OHSTAT and PDCSTAT with no success either).

Is there something missing or wrong ?


PS : a little bug : when saving the dashboard, then close and open it again, the map is not shown properly and the panel stay black. I have to slightly resize the panel so that it appears again.