Thanks all who were looking into this!
The "Force all edges" was there before the "Fake Stones", I remember. I did not disable the setting because I forgot about it.
But who would have thought it would not play well together with the "Fake Stones Shader"...
Maybe it is something you guys at planetside want to look into sometime.
Anyways, now off todisable this settingg before I forget again
CHeers, Klaus