I made an enquiry about compatibility with Cross map, Walls and Tiles and Omnitiles, with V-Ray Next and Forest Pack Pro and Railclone asking if they were aware of any problems/issues and any fixes/patches etc... and I got this reply
"our plugins support Max 2019 and vray next, if you have the newest versions. Some older customers
need to download the latest installers to get max 2019 support and vray next support, but if you are
a new customer you´ll get the new installers right away.
Regarding Forest Pack Pro, we are aware of one problem with our plugin Crossmap, which affects one
distribution mode in Crossmap. This is the same with Forest Pack Pro and Railclone as it seems in
combination with vray next. We are working on a fix and hope to release and update for Crossmap soon."