Hi @Rene_Paterno,
this was due to the removal of the mapsurfer baselayer.
The problem should have been fixed by now.
It could be that your browser still had the mapsurfer basemap remembered.
You can either select a new basemap using the selection. Or clear the browser cache and reload the site.
Sadly the mapsurfer layout will not be available anymore. There are plans for it to be commercialized, but i’m not sure when this will happen.
See
and
https://groups.google.com/forum/#!topic/mapsurfer-net/sjNg41c3Jng
Best regards