Hello Daniel,
an 500 error? Did you see that when you open the link? Hopefully not.
I mean that there is no marker (pin) on this map (Unser Standort):
canoeguide.net/kanutouren-schweden-ueber...erlake-camp-kanot-ab
But there should be one. I show the position of the canoe rental companys with the plugin ( {hotspots hotspot=xxx} ). And this plugin only works when the Pin of the hotspots is from the category. If use the functionality of the hotspot "custom marker" then the plugin {hotspots hotspot=xxx} did not show ne marker on the embeded map.
I send you the example with the hotspot "Silverlake Camp & Kanot AB" because there I use a special marker and not the marker of the category.
Hope now is clear what I mean otherwise ... werde ich das ganze nochmal auf Deutsch erklären