When you save out a grid domain in .bin format (this is exported by default) and import into Krakatoa via PRT Loader it will not render. Frost does not have an issue with it, PRT Loader properly display in VP, it just does not render.
I sent Paul a debug file for a frost issue that contians 10 frames of a grid domain that exhibits this issue.
I can verify the particles are good by loading each Grid Emitter and they will render.
This is usually caused by a default Density channel in the BIN file which RealFlow saves as 0.0.
Drop a KCM on top and set Density to 1.0.
If that does not help, let me know.
LOL thanks, I starting to have an “oh no” moment, I already had to recreate everything and test it for v1.6