It worked perfectly. Now I get the error message before saving: Can not export geometry. …whose geometry type is class com.vividsolutions.jts.geom.Geometry.
Projection is correct (see properties) but that format of the geometry is not accepted.
Exporting Pins and GCPs to shape works well. Many thanks for the fine service.
I have now reinstall SNAP5.0.0 - running with no later updates: and it works. Hence a bug has been introduced later.
Also at a certain moment (!) renaming a file is no more possible, e.g. using Band Math - “new_band_1” into something meaningful.
Juerg