I've set up a particle fluid tank asset similar to the one Noseman featured in his Siggraph 2015 Rewind available here - http://www.cineversity.com/vidplaytut/siggraph_2015_rewind_athanasios_pozantzis_houdini_and_cinema_4d_r17 [www.cineversity.com]
My network ends with 5 geo nodes: 4 which export the different point groups (water, foam, spray, and bubbles) with their own color.
And the last is a RBD sphere used for collision. That network ends in a dop import sop.
No matter how I open my asset in Cinema 4D, I don't see my particles. I've read about the issue where at least one particle needs to exist at frame 1 in order for it to work, but all the particles in my FLIP tank exist at frame one, so I'm unsure of the issue.
In Cinema 4D, I experience a number of things. The asset imports green, but nothing is visible in viewport, not even the collision object. In previous imports, I could see the collision object, but no particles. Sometimes, the asset imports a number of particle geometry objects that, nevertheless, don't really correspond with the groups I've created. However, never any particles.
I've also checked that everything in the asset uses relative paths.