[friederb]

!PROBLEM SOLVED!

While waiting for a helping answer I started another time deactivating any plugin in my installation, something that always involves the risk of ending up installing the whole damn thing from start …

but I was lucky and found the problemmaker: the Plugin “WP Click Check” was the source of this errormessage. After deactivating it anything was clean and smooth … aeehmm, mostly everything … great stuff: wp+bp!))