I even tried the 'shadow catch only' in Firefly in PP-11 - same thing. It still rendered the ground prop anyway. If I unchecked the 'visible' tick box in the properties tab, away went the ground prop - and the shadows. I even tried using a primitive ground plane prop. Same thing. It's either all or nothing.

Per BB's comment, I'm sure it can be done - it's just eluding me so far... Oh well, I've got it, so I'll play with it and use PP2014 for my 'serious' stuff. I can always spiff things up in Photoshop...

"I reject your reality and substitute my own" - Adam Savage