I can't seem to use any of Sverchok's mesh filter tools. Did something change in Blender 2.8? With reference to the tutorial at: https://sverchok.readthedocs.io/en/latest/nodes/analyzers/mesh_filter.html, none of the examples shown appear to work in Blender 2.8.
Am I missing something obvious?
I don't know what you are doing and how your layout looks like, but node tree checcked now: