DAZ Stops Rendering Caustics If I add stuff to Scene

DrowElfMorwen

No idea how this is happening, but it is highly frustrating. I am rendering caustics with JM's Under Sea product, where caustics are made with a lgiht shining down on a plane with bump bamps to get caustics to show up. Everything works nicely at first--but for SOME reason, even though caustics are already showing up and working fine, if I add more props to the scene, the caustics stop rendering. The props are NOT blocking the light or the thing making the caustics. I've had this happen multiple times over the course of many different scenes. Please advise? IT's frustrating spending hours getting caustics and lighting perfect only to have it ruined because I added a random prop to the scene.

Also, caustics stops if I add a light to the BACK of the scene, like for godrays. It also stops if I try using an atmosphere, but I think I can understand that one. Somewhat. Makes ocean scenes very difficult, though.

DrowElfMorwen

Please view the example scene here:

https://sta.sh/017x3ryot71w