I've got a FLIP sim built mostly from shelf tools, but modified somewhat. It seems to work, except that the fluid compress node doesn't seem to be retaining any of the particles.

The geometry spreadsheet details view of the fluid compress node says:
-fluidcompress_particlescompressed: 0
-fluidcompress_particlesuncompressed: 0

I've tried turning cull bandwidth on and off and all sorts of values, but nothing works.

If I bypass the fluid compress node, surfacing doesn't seem to work at all, so it's possible that the problem is in my Dop I/O or previous. I'm lost though.

Any insight would be appreciated.

Solved. I wasn't creating all of the fields that the fluid compress node needed to work correctly. I switched to creating my flip fluid using a “fluid source” node and all is well. It seems to create all the fields I needed.