*Hi, make sure 'shadow catch only' is unchecked for the ground plane.*

Thanks: that worked.

A remaining minor query: this cutout from an affected image shows a boat's nameplate as a small prop textured from a 61 x 470 texture map. In the Poser 4 renderer the name shows sharp, as intended. In Firefly the name shows badly blurred, as here. Please how to cure this?