Not working when NextGEN Gallery plugin activated

Hi,
first of all: great plugin!! 🙂
I now (after updating WordPress and the plugins to the newest versions) have the problem that the Map plugin doesn’t work when the NexGEN Gallery plugin is activated at the same time. It just shows a white space instead of the map.

Is this a known problem? Is there a workaround?
See here as an example: http://strollingeast.com/dali-vom-backpackernest-zur-souvenirstadt/.
Thanks!

https://ww.wp.xz.cn/plugins/google-maps-gpx-viewer/